misp-rfc/misp-core-format/raw.md.txt

Network Working Group                                        A. Dulaunoy
Internet-Draft                                                 A. Iklody
Intended status: Informational                                     CIRCL
Expires: April 24, 2021                                 October 21, 2020


                            MISP core format
                    draft-dulaunoy-misp-core-format

Abstract

   This document describes the MISP core format used to exchange
   indicators and threat information between MISP (Open Source Threat
   Intelligence Sharing Platform formerly known as Malware Information
   Sharing Platform) instances.  The JSON format includes the overall
   structure along with the semantic associated for each respective key.
   The format is described to support other implementations which reuse
   the format and ensuring an interoperability with existing MISP
   [MISP-P] software and other Threat Intelligence Platforms.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 24, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must



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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions and Terminology . . . . . . . . . . . . . . .   3
   2.  Format  . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Event . . . . . . . . . . . . . . . . . . . . . . . . . .   3
       2.2.1.  Event Attributes  . . . . . . . . . . . . . . . . . .   4
     2.3.  Objects . . . . . . . . . . . . . . . . . . . . . . . . .   7
       2.3.1.  Org . . . . . . . . . . . . . . . . . . . . . . . . .   7
       2.3.2.  Orgc  . . . . . . . . . . . . . . . . . . . . . . . .   8
     2.4.  Attribute . . . . . . . . . . . . . . . . . . . . . . . .   8
       2.4.1.  Sample Attribute Object . . . . . . . . . . . . . . .   9
       2.4.2.  Attribute Attributes  . . . . . . . . . . . . . . . .   9
     2.5.  ShadowAttribute . . . . . . . . . . . . . . . . . . . . .  16
       2.5.1.  Sample Attribute Object . . . . . . . . . . . . . . .  16
       2.5.2.  ShadowAttribute Attributes  . . . . . . . . . . . . .  16
       2.5.3.  Org . . . . . . . . . . . . . . . . . . . . . . . . .  22
     2.6.  Object  . . . . . . . . . . . . . . . . . . . . . . . . .  23
       2.6.1.  Sample Object . . . . . . . . . . . . . . . . . . . .  23
       2.6.2.  Object Attributes . . . . . . . . . . . . . . . . . .  24
     2.7.  Object References . . . . . . . . . . . . . . . . . . . .  28
       2.7.1.  Sample ObjectReference object . . . . . . . . . . . .  28
       2.7.2.  ObjectReference Attributes  . . . . . . . . . . . . .  28
     2.8.  EventReport . . . . . . . . . . . . . . . . . . . . . . .  30
       2.8.1.  id  . . . . . . . . . . . . . . . . . . . . . . . . .  31
       2.8.2.  UUID  . . . . . . . . . . . . . . . . . . . . . . . .  31
       2.8.3.  event_id  . . . . . . . . . . . . . . . . . . . . . .  31
       2.8.4.  name  . . . . . . . . . . . . . . . . . . . . . . . .  31
       2.8.5.  content . . . . . . . . . . . . . . . . . . . . . . .  31
       2.8.6.  distribution  . . . . . . . . . . . . . . . . . . . .  32
       2.8.7.  sharing_group_id  . . . . . . . . . . . . . . . . . .  32
       2.8.8.  timestamp . . . . . . . . . . . . . . . . . . . . . .  32
       2.8.9.  deleted . . . . . . . . . . . . . . . . . . . . . . .  33
     2.9.  Tag . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
       2.9.1.  Sample Tag  . . . . . . . . . . . . . . . . . . . . .  33
     2.10. Sighting  . . . . . . . . . . . . . . . . . . . . . . . .  33
       2.10.1.  Sample Sighting  . . . . . . . . . . . . . . . . . .  34
     2.11. Galaxy  . . . . . . . . . . . . . . . . . . . . . . . . .  35
       2.11.1.  Sample Galaxy  . . . . . . . . . . . . . . . . . . .  35
   3.  JSON Schema . . . . . . . . . . . . . . . . . . . . . . . . .  37
   4.  Manifest  . . . . . . . . . . . . . . . . . . . . . . . . . .  51
     4.1.  Format  . . . . . . . . . . . . . . . . . . . . . . . . .  51
       4.1.1.  Sample Manifest . . . . . . . . . . . . . . . . . . .  52



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   5.  Implementation  . . . . . . . . . . . . . . . . . . . . . . .  53
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  53
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  53
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  53
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  53
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  54
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  54
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  54

1.  Introduction

   Sharing threat information became a fundamental requirements in the
   Internet, security and intelligence community at large.  Threat
   information can include indicators of compromise, malicious file
   indicators, financial fraud indicators or even detailed information
   about a threat actor.  MISP [MISP-P] started as an open source
   project in late 2011 and the MISP format started to be widely used as
   an exchange format within the community in the past years.  The aim
   of this document is to describe the specification and the MISP core
   format.

1.1.  Conventions and Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  Format

2.1.  Overview

   The MISP core format is in the JSON [RFC8259] format.  In MISP, an
   event is composed of a single JSON object.

   A capitalized key (like Event, Org) represent a data model and a non-
   capitalised key is just an attribute.  This nomenclature can support
   an implementation to represent the MISP format in another data
   structure.

2.2.  Event

   An event is a simple meta structure scheme where attributes and meta-
   data are embedded to compose a coherent set of indicators.  An event
   can be composed from an incident, a security analysis report or a
   specific threat actor analysis.  The meaning of an event only depends
   of the information embedded in the event.





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2.2.1.  Event Attributes

2.2.1.1.  uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the event.  The uuid MUST be preserved for any updates or transfer of
   the same event.  UUID version 4 is RECOMMENDED when assigning it to a
   new event.

   uuid is represented as a JSON string. uuid MUST be present.

2.2.1.2.  id

   id represents the human-readable identifier associated to the event
   for a specific MISP instance.  A human-readable identifier MUST be
   represented as an unsigned integer.

   id is represented as a JSON string. id SHALL be present.

2.2.1.3.  published

   published represents the event publication state.  If the event was
   published, the published value MUST be true.  In any other
   publication state, the published value MUST be false.

   published is represented as a JSON boolean. published MUST be
   present.

2.2.1.4.  info

   info represents the information field of the event. info is a free-
   text value to provide a human-readable summary of the event. info
   SHOULD NOT be bigger than 256 characters and SHOULD NOT include new-
   lines.

   info is represented as a JSON string. info MUST be present.

2.2.1.5.  threat_level_id

   threat_level_id represents the threat level.

   4:
      Undefined

   3:
      Low

   2:



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      Medium

   1:
      High

   If a higher granularity is required, a MISP taxonomy applied as a Tag
   SHOULD be preferred.

   threat_level_id is represented as a JSON string. threat_level_id
   SHALL be present.

2.2.1.6.  analysis

   analysis represents the analysis level.

   0:
      Initial

   1:
      Ongoing

   2:
      Complete

   If a higher granularity is required, a MISP taxonomy applied as a Tag
   SHOULD be preferred.

   analysis is represented as a JSON string. analysis SHALL be present.

2.2.1.7.  date

   date represents a reference date to the event in ISO 8601 format
   (date only: YYYY-MM-DD).  This date corresponds to the date the event
   occurred, which may be in the past.

   date is represented as a JSON string. date MUST be present.

2.2.1.8.  timestamp

   timestamp represents a reference time when the event, or one of the
   attributes within the event was created, or last updated/edited on
   the instance. timestamp is expressed in seconds (decimal) since 1st
   of January 1970 (Unix timestamp).  The time zone MUST be UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.






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2.2.1.9.  publish_timestamp

   publish_timestamp represents a reference time when the event was
   published on the instance. published_timestamp is expressed in
   seconds (decimal) since 1st of January 1970 (Unix timestamp).  At
   each publication of an event, publish_timestamp MUST be updated.  The
   time zone MUST be UTC.  If the published_timestamp is present and the
   published flag is set to false, the publish_timestamp represents the
   previous publication timestamp.  If the event was never published,
   the published_timestamp MUST be set to 0.

   publish_timestamp is represented as a JSON string. publish_timestamp
   MUST be present.

2.2.1.10.  org_id

   org_id represents a human-readable identifier referencing an Org
   object of the organisation which generated the event.  A human-
   readable identifier MUST be represented as an unsigned integer.

   The org_id MUST be updated when the event is generated by a new
   instance.

   org_id is represented as a JSON string. org_id MUST be present.

2.2.1.11.  orgc_id

   orgc_id represents a human-readable identifier referencing an Orgc
   object of the organisation which created the event.

   The orgc_id and Org object MUST be preserved for any updates or
   transfer of the same event.

   orgc_id is represented as a JSON string. orgc_id MUST be present.

2.2.1.12.  attribute_count

   attribute_count represents the number of attributes in the event.
   attribute_count is expressed in decimal.

   attribute_count is represented as a JSON string. attribute_count
   SHALL be present.

2.2.1.13.  distribution

   distribution represents the basic distribution rules of the event.
   The system must adhere to the distribution setting for access control
   and for dissemination of the event.



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   distribution is represented by a JSON string. distribution MUST be
   present and be one of the following options:

   0
      Your Organisation Only

   1
      This Community Only

   2
      Connected Communities

   3
      All Communities

   4
      Sharing Group

2.2.1.14.  sharing_group_id

   sharing_group_id represents a human-readable identifier referencing a
   Sharing Group object that defines the distribution of the event, if
   distribution level "4" is set.  A human-readable identifier MUST be
   represented as an unsigned integer.

   sharing_group_id is represented by a JSON string and SHOULD be
   present.  If a distribution level other than "4" is chosen the
   sharing_group_id MUST be set to "0".

2.2.1.15.  extends_uuid

   extends_uuid represents which event is extended by this event.  The
   extends_uuid is described as a Universally Unique IDentifier (UUID)
   [RFC4122] with the UUID of the extended event.

   extends_uuid is represented as a JSON string. extends_uuid SHOULD be
   present.

2.3.  Objects

2.3.1.  Org

   An Org object is composed of an uuid, name and id.

   The uuid represents the Universally Unique IDentifier (UUID)
   [RFC4122] of the organisation.  The organisation UUID is globally
   assigned to an organisation and SHALL be kept overtime.




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   The name is a readable description of the organisation and SHOULD be
   present.  The id is a human-readable identifier generated by the
   instance and used as reference in the event.  A human-readable
   identifier MUST be represented as an unsigned integer.

   uuid, name and id are represented as a JSON string. uuid, name and id
   MUST be present.

2.3.1.1.  Sample Org Object

          "Org": {
                  "id": "2",
                  "name": "CIRCL",
                  "uuid": "55f6ea5e-2c60-40e5-964f-47a8950d210f"
                 }

2.3.2.  Orgc

   An Orgc object is composed of an uuid, name and id.

   The uuid MUST be preserved for any updates or transfer of the same
   event.  UUID version 4 is RECOMMENDED when assigning it to a new
   event.  The organisation UUID is globally assigned to an organisation
   and SHALL be kept overtime.

   The name is a readable description of the organisation and SHOULD be
   present.  The id is a human-readable identifier generated by the
   instance and used as reference in the event.  A human-readable
   identifier MUST be represented as an unsigned integer.

   uuid, name and id are represented as a JSON string. uuid, name and id
   MUST be present.

2.4.  Attribute

   Attributes are used to describe the indicators and contextual data of
   an event.  The main information contained in an attribute is made up
   of a category-type-value triplet, where the category and type give
   meaning and context to the value.  Through the various category-type
   combinations a wide range of information can be conveyed.

   A MISP document MUST at least includes category-type-value triplet
   described in section "Attribute Attributes".








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2.4.1.  Sample Attribute Object

      "Attribute": {
                    "id": "346056",
                    "type": "comment",
                    "category": "Other",
                    "to_ids": false,
                    "uuid": "57f4f6d9-cd20-458b-84fd-109ec0a83869",
                    "event_id": "3357",
                    "distribution": "5",
                    "timestamp": "1475679332",
                    "comment": "",
                    "sharing_group_id": "0",
                    "deleted": false,
                    "value": "Hello world",
                    "SharingGroup": [],
                    "ShadowAttribute": [],
                    "RelatedAttribute": [],
                    "first_seen": "2019-06-02T22:14:28.711954+00:00",
                    "last_seen": null
                   }

2.4.2.  Attribute Attributes

2.4.2.1.  uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the event.  The uuid MUST be preserved for any updates or transfer of
   the same event.  UUID version 4 is RECOMMENDED when assigning it to a
   new event.

   uuid is represented as a JSON string. uuid MUST be present.

2.4.2.2.  id

   id represents the human-readable identifier associated to the event
   for a specific MISP instance.  A human-readable identifier MUST be
   represented as an unsigned integer.

   id is represented as a JSON string. id SHALL be present.

2.4.2.3.  type

   type represents the means through which an attribute tries to
   describe the intent of the attribute creator, using a list of pre-
   defined attribute types.





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   type is represented as a JSON string. type MUST be present and it
   MUST be a valid selection for the chosen category.  The list of valid
   category-type combinations is as follows:

   Antivirus detection
      link, comment, text, hex, attachment, other, anonymised

   Artifacts dropped
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, cdhash, filename, filename|md5,
      filename|sha1, filename|sha224, filename|sha256, filename|sha384,
      filename|sha512, filename|sha512/224, filename|sha512/256,
      filename|sha3-224, filename|sha3-256, filename|sha3-384,
      filename|sha3-512, filename|authentihash, filename|vhash,
      filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, regkey, regkey|value, pattern-
      in-file, pattern-in-memory, filename-pattern, pdb, stix2-pattern,
      yara, sigma, attachment, malware-sample, named pipe, mutex,
      windows-scheduled-task, windows-service-name, windows-service-
      displayname, comment, text, hex, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, other, cookie, gene,
      kusto-query, mime-type, anonymised, pgp-public-key, pgp-private-
      key

   Attribution
      threat-actor, campaign-name, campaign-id, whois-registrant-phone,
      whois-registrant-email, whois-registrant-name, whois-registrant-
      org, whois-registrar, whois-creation-date, comment, text, x509-
      fingerprint-sha1, x509-fingerprint-md5, x509-fingerprint-sha256,
      other, dns-soa-email, anonymised, email

   External analysis
      md5, sha1, sha256, sha3-224, sha3-256, sha3-384, sha3-512,
      filename, filename|md5, filename|sha1, filename|sha256,
      filename|sha3-224, filename|sha3-256, filename|sha3-384,
      filename|sha3-512, ip-src, ip-dst, ip-dst|port, ip-src|port, mac-
      address, mac-eui-64, hostname, domain, domain|ip, url, user-agent,
      regkey, regkey|value, AS, snort, bro, zeek, pattern-in-file,
      pattern-in-traffic, pattern-in-memory, filename-pattern,
      vulnerability, cpe, weakness, attachment, malware-sample, link,
      comment, text, x509-fingerprint-sha1, x509-fingerprint-md5, x509-
      fingerprint-sha256, ja3-fingerprint-md5, hassh-md5, hasshserver-
      md5, github-repository, other, cortex, anonymised, community-id

   Financial fraud
      btc, dash, xmr, iban, bic, bank-account-nr, aba-rtn, bin, cc-
      number, prtn, phone-number, comment, text, other, hex, anonymised



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   Internal reference
      text, link, comment, other, hex, anonymised, git-commit-id

   Network activity
      ip-src, ip-dst, ip-dst|port, ip-src|port, port, hostname, domain,
      domain|ip, mac-address, mac-eui-64, email, email-dst, email-src,
      eppn, url, uri, user-agent, http-method, AS, snort, pattern-in-
      file, filename-pattern, stix2-pattern, pattern-in-traffic,
      attachment, comment, text, x509-fingerprint-md5, x509-fingerprint-
      sha1, x509-fingerprint-sha256, ja3-fingerprint-md5, hassh-md5,
      hasshserver-md5, other, hex, cookie, hostname|port, bro, zeek,
      anonymised, community-id, email-subject

   Other
      comment, text, other, size-in-bytes, counter, datetime, cpe, port,
      float, hex, phone-number, boolean, anonymised, pgp-public-key,
      pgp-private-key

   Payload delivery
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, pehash, tlsh, cdhash, filename,
      filename|md5, filename|sha1, filename|sha224, filename|sha256,
      filename|sha384, filename|sha512, filename|sha512/224,
      filename|sha512/256, filename|sha3-224, filename|sha3-256,
      filename|sha3-384, filename|sha3-512, filename|authentihash,
      filename|vhash, filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, mac-address, mac-eui-64, ip-
      src, ip-dst, ip-dst|port, ip-src|port, hostname, domain, email,
      email-src, email-dst, email-subject, email-attachment, email-body,
      url, user-agent, AS, pattern-in-file, pattern-in-traffic,
      filename-pattern, stix2-pattern, yara, sigma, mime-type,
      attachment, malware-sample, link, malware-type, comment, text,
      hex, vulnerability, cpe, weakness, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, ja3-fingerprint-md5,
      hassh-md5, hasshserver-md5, other, hostname|port, email-dst-
      display-name, email-src-display-name, email-header, email-reply-
      to, email-x-mailer, email-mime-boundary, email-thread-index,
      email-message-id, mobile-application-id, chrome-extension-id,
      whois-registrant-email, anonymised

   Payload installation
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, pehash, tlsh, cdhash, filename,
      filename|md5, filename|sha1, filename|sha224, filename|sha256,
      filename|sha384, filename|sha512, filename|sha512/224,
      filename|sha512/256, filename|sha3-224, filename|sha3-256,



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      filename|sha3-384, filename|sha3-512, filename|authentihash,
      filename|vhash, filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, pattern-in-file, pattern-in-
      traffic, pattern-in-memory, filename-pattern, stix2-pattern, yara,
      sigma, vulnerability, cpe, weakness, attachment, malware-sample,
      malware-type, comment, text, hex, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, mobile-application-id,
      chrome-extension-id, other, mime-type, anonymised

   Payload type
      comment, text, other, anonymised

   Persistence mechanism
      filename, regkey, regkey|value, comment, text, other, hex,
      anonymised

   Person
      first-name, middle-name, last-name, date-of-birth, place-of-birth,
      gender, passport-number, passport-country, passport-expiration,
      redress-number, nationality, visa-number, issue-date-of-the-visa,
      primary-residence, country-of-residence, special-service-request,
      frequent-flyer-number, travel-details, payment-details, place-
      port-of-original-embarkation, place-port-of-clearance, place-port-
      of-onward-foreign-destination, passenger-name-record-locator-
      number, comment, text, other, phone-number, identity-card-number,
      anonymised, email, pgp-public-key, pgp-private-key

   Social network
      github-username, github-repository, github-organisation, jabber-
      id, twitter-id, email, email-src, email-dst, eppn, comment, text,
      other, whois-registrant-email, anonymised, pgp-public-key, pgp-
      private-key

   Support Tool
      link, text, attachment, comment, other, hex, anonymised

   Targeting data
      target-user, target-email, target-machine, target-org, target-
      location, target-external, comment, anonymised

   Attributes are based on the usage within their different communities.
   Attributes can be extended on a regular basis and this reference
   document is updated accordingly.








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2.4.2.4.  category

   category represents the intent of what the attribute is describing as
   selected by the attribute creator, using a list of pre-defined
   attribute categories.

   category is represented as a JSON string. category MUST be present
   and it MUST be a valid selection for the chosen type.  The list of
   valid category-type combinations is mentioned above.

2.4.2.5.  to_ids

   to_ids represents whether the attribute is meant to be actionable.
   Actionable defined attributes that can be used in automated processes
   as a pattern for detection in Local or Network Intrusion Detection
   System, log analysis tools or even filtering mechanisms.

   to_ids is represented as a JSON boolean. to_ids MUST be present.

2.4.2.6.  event_id

   event_id represents a human-readable identifier referencing the Event
   object that the attribute belongs to.  A human-readable identifier
   MUST be represented as an unsigned integer.

   The event_id SHOULD be updated when the event is imported to reflect
   the newly created event's id on the instance.

   event_id is represented as a JSON string. event_id MUST be present.

2.4.2.7.  distribution

   distribution represents the basic distribution rules of the
   attribute.  The system must adhere to the distribution setting for
   access control and for dissemination of the attribute.

   distribution is represented by a JSON string. distribution MUST be
   present and be one of the following options:

   0
      Your Organisation Only

   1
      This Community Only

   2
      Connected Communities




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   3
      All Communities

   4
      Sharing Group

   5
      Inherit Event

2.4.2.8.  timestamp

   timestamp represents a reference time when the attribute was created
   or last modified. timestamp is expressed in seconds (decimal) since
   1st of January 1970 (Unix timestamp).  The time zone MUST be UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.

2.4.2.9.  comment

   comment is a contextual comment field.

   comment is represented by a JSON string. comment MAY be present.

2.4.2.10.  sharing_group_id

   sharing_group_id represents a human-readable identifier referencing a
   Sharing Group object that defines the distribution of the attribute,
   if distribution level "4" is set.  A human-readable identifier MUST
   be represented as an unsigned integer.

   sharing_group_id is represented by a JSON string and SHOULD be
   present.  If a distribution level other than "4" is chosen the
   sharing_group_id MUST be set to "0".

2.4.2.11.  deleted

   deleted represents a setting that allows attributes to be revoked.
   Revoked attributes are not actionable and exist merely to inform
   other instances of a revocation.

   deleted is represented by a JSON boolean. deleted MUST be present.

2.4.2.12.  data

   data contains the base64 encoded contents of an attachment or a
   malware sample.  For malware samples, the sample MUST be encrypted
   using a password protected zip archive, with the password being
   "infected".



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   data is represented by a JSON string in base64 encoding. data MUST be
   set for attributes of type malware-sample and attachment.

2.4.2.13.  RelatedAttribute

   RelatedAttribute is an array of attributes correlating with the
   current attribute.  Each element in the array represents an JSON
   object which contains an Attribute dictionnary with the external
   attributes who correlate.  Each Attribute MUST include the id,
   org_id, info and a value.  Only the correlations found on the local
   instance are shown in RelatedAttribute.

   RelatedAttribute MAY be present.

2.4.2.14.  ShadowAttribute

   ShadowAttribute is an array of shadow attributes that serve as
   proposals by third parties to alter the containing attribute.  The
   structure of a ShadowAttribute is similar to that of an Attribute,
   which can be accepted or discarded by the event creator.  If
   accepted, the original attribute containing the shadow attribute is
   removed and the shadow attribute is converted into an attribute.

   Each shadow attribute that references an attribute MUST contain the
   containing attribute's ID in the old_id field and the event's ID in
   the event_id field.

2.4.2.15.  value

   value represents the payload of an attribute.  The format of the
   value is dependent on the type of the attribute.

   value is represented by a JSON string. value MUST be present.

2.4.2.16.  first_seen

   first_seen represents a reference time when the attribute was first
   seen. first_seen is expressed as an ISO 8601 datetime up to the
   micro-second with time zone support.

   first_seen is represented as a JSON string. first_seen MAY be
   present.

2.4.2.17.  last_seen

   last_seen represents a reference time when the attribute was last
   seen. last_seen is expressed as an ISO 8601 datetime up to the micro-
   second with time zone support.



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   last_seen is represented as a JSON string. last_seen MAY be present.

2.5.  ShadowAttribute

   ShadowAttributes are 3rd party created attributes that either propose
   to add new information to an event or modify existing information.
   They are not meant to be actionable until the event creator accepts
   them - at which point they will be converted into attributes or
   modify an existing attribute.

   They are similar in structure to Attributes but additionally carry a
   reference to the creator of the ShadowAttribute as well as a
   revocation flag.

2.5.1.  Sample Attribute Object

"ShadowAttribute":  {
                       "id": "8",
                       "type": "ip-src",
                       "category": "Network activity",
                       "to_ids": false,
                       "uuid": "57d475f1-da78-4569-89de-1458c0a83869",
                       "event_uuid": "57d475e6-41c4-41ca-b450-145ec0a83869",
                       "event_id": "9",
                       "old_id": "319",
                       "comment": "",
                       "org_id": "1",
                       "proposal_to_delete": false,
                       "value": "5.5.5.5",
                       "deleted": false,
                       "Org": {
                           "id": "1",
                           "name": "MISP",
                           "uuid": "568cce5a-0c80-412b-8fdf-1ffac0a83869"
                       },
                       "first_seen": "2019-06-02T22:14:28.711954+00:00",
                       "last_seen": null
                   }

2.5.2.  ShadowAttribute Attributes

2.5.2.1.  uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the event.  The uuid MUST be preserved for any updates or transfer of
   the same event.  UUID version 4 is RECOMMENDED when assigning it to a
   new event.




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   uuid is represented as a JSON string. uuid MUST be present.

2.5.2.2.  id

   id represents the human-readable identifier associated to the event
   for a specific MISP instance. human-readable identifier MUST be
   represented as an unsigned integer.  id is represented as a JSON
   string. id SHALL be present.

2.5.2.3.  type

   type represents the means through which an attribute tries to
   describe the intent of the attribute creator, using a list of pre-
   defined attribute types.

   type is represented as a JSON string. type MUST be present and it
   MUST be a valid selection for the chosen category.  The list of valid
   category-type combinations is as follows:

   Antivirus detection
      link, comment, text, hex, attachment, other, anonymised

   Artifacts dropped
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, cdhash, filename, filename|md5,
      filename|sha1, filename|sha224, filename|sha256, filename|sha384,
      filename|sha512, filename|sha512/224, filename|sha512/256,
      filename|sha3-224, filename|sha3-256, filename|sha3-384,
      filename|sha3-512, filename|authentihash, filename|vhash,
      filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, regkey, regkey|value, pattern-
      in-file, pattern-in-memory, filename-pattern, pdb, stix2-pattern,
      yara, sigma, attachment, malware-sample, named pipe, mutex,
      windows-scheduled-task, windows-service-name, windows-service-
      displayname, comment, text, hex, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, other, cookie, gene,
      kusto-query, mime-type, anonymised, pgp-public-key, pgp-private-
      key

   Attribution
      threat-actor, campaign-name, campaign-id, whois-registrant-phone,
      whois-registrant-email, whois-registrant-name, whois-registrant-
      org, whois-registrar, whois-creation-date, comment, text, x509-
      fingerprint-sha1, x509-fingerprint-md5, x509-fingerprint-sha256,
      other, dns-soa-email, anonymised, email

   External analysis



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      md5, sha1, sha256, sha3-224, sha3-256, sha3-384, sha3-512,
      filename, filename|md5, filename|sha1, filename|sha256,
      filename|sha3-224, filename|sha3-256, filename|sha3-384,
      filename|sha3-512, ip-src, ip-dst, ip-dst|port, ip-src|port, mac-
      address, mac-eui-64, hostname, domain, domain|ip, url, user-agent,
      regkey, regkey|value, AS, snort, bro, zeek, pattern-in-file,
      pattern-in-traffic, pattern-in-memory, filename-pattern,
      vulnerability, cpe, weakness, attachment, malware-sample, link,
      comment, text, x509-fingerprint-sha1, x509-fingerprint-md5, x509-
      fingerprint-sha256, ja3-fingerprint-md5, hassh-md5, hasshserver-
      md5, github-repository, other, cortex, anonymised, community-id

   Financial fraud
      btc, dash, xmr, iban, bic, bank-account-nr, aba-rtn, bin, cc-
      number, prtn, phone-number, comment, text, other, hex, anonymised

   Internal reference
      text, link, comment, other, hex, anonymised, git-commit-id

   Network activity
      ip-src, ip-dst, ip-dst|port, ip-src|port, port, hostname, domain,
      domain|ip, mac-address, mac-eui-64, email, email-dst, email-src,
      eppn, url, uri, user-agent, http-method, AS, snort, pattern-in-
      file, filename-pattern, stix2-pattern, pattern-in-traffic,
      attachment, comment, text, x509-fingerprint-md5, x509-fingerprint-
      sha1, x509-fingerprint-sha256, ja3-fingerprint-md5, hassh-md5,
      hasshserver-md5, other, hex, cookie, hostname|port, bro, zeek,
      anonymised, community-id, email-subject

   Other
      comment, text, other, size-in-bytes, counter, datetime, cpe, port,
      float, hex, phone-number, boolean, anonymised, pgp-public-key,
      pgp-private-key

   Payload delivery
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, pehash, tlsh, cdhash, filename,
      filename|md5, filename|sha1, filename|sha224, filename|sha256,
      filename|sha384, filename|sha512, filename|sha512/224,
      filename|sha512/256, filename|sha3-224, filename|sha3-256,
      filename|sha3-384, filename|sha3-512, filename|authentihash,
      filename|vhash, filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, mac-address, mac-eui-64, ip-
      src, ip-dst, ip-dst|port, ip-src|port, hostname, domain, email,
      email-src, email-dst, email-subject, email-attachment, email-body,
      url, user-agent, AS, pattern-in-file, pattern-in-traffic,
      filename-pattern, stix2-pattern, yara, sigma, mime-type,



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      attachment, malware-sample, link, malware-type, comment, text,
      hex, vulnerability, cpe, weakness, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, ja3-fingerprint-md5,
      hassh-md5, hasshserver-md5, other, hostname|port, email-dst-
      display-name, email-src-display-name, email-header, email-reply-
      to, email-x-mailer, email-mime-boundary, email-thread-index,
      email-message-id, mobile-application-id, chrome-extension-id,
      whois-registrant-email, anonymised

   Payload installation
      md5, sha1, sha224, sha256, sha384, sha512, sha512/224, sha512/256,
      sha3-224, sha3-256, sha3-384, sha3-512, ssdeep, imphash, telfhash,
      impfuzzy, authentihash, vhash, pehash, tlsh, cdhash, filename,
      filename|md5, filename|sha1, filename|sha224, filename|sha256,
      filename|sha384, filename|sha512, filename|sha512/224,
      filename|sha512/256, filename|sha3-224, filename|sha3-256,
      filename|sha3-384, filename|sha3-512, filename|authentihash,
      filename|vhash, filename|ssdeep, filename|tlsh, filename|imphash,
      filename|impfuzzy, filename|pehash, pattern-in-file, pattern-in-
      traffic, pattern-in-memory, filename-pattern, stix2-pattern, yara,
      sigma, vulnerability, cpe, weakness, attachment, malware-sample,
      malware-type, comment, text, hex, x509-fingerprint-sha1, x509-
      fingerprint-md5, x509-fingerprint-sha256, mobile-application-id,
      chrome-extension-id, other, mime-type, anonymised

   Payload type
      comment, text, other, anonymised

   Persistence mechanism
      filename, regkey, regkey|value, comment, text, other, hex,
      anonymised

   Person
      first-name, middle-name, last-name, date-of-birth, place-of-birth,
      gender, passport-number, passport-country, passport-expiration,
      redress-number, nationality, visa-number, issue-date-of-the-visa,
      primary-residence, country-of-residence, special-service-request,
      frequent-flyer-number, travel-details, payment-details, place-
      port-of-original-embarkation, place-port-of-clearance, place-port-
      of-onward-foreign-destination, passenger-name-record-locator-
      number, comment, text, other, phone-number, identity-card-number,
      anonymised, email, pgp-public-key, pgp-private-key

   Social network
      github-username, github-repository, github-organisation, jabber-
      id, twitter-id, email, email-src, email-dst, eppn, comment, text,
      other, whois-registrant-email, anonymised, pgp-public-key, pgp-
      private-key



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   Support Tool
      link, text, attachment, comment, other, hex, anonymised

   Targeting data
      target-user, target-email, target-machine, target-org, target-
      location, target-external, comment, anonymised

   Attributes are based on the usage within their different communities.
   Attributes can be extended on a regular basis and this reference
   document is updated accordingly.

2.5.2.4.  category

   category represents the intent of what the attribute is describing as
   selected by the attribute creator, using a list of pre-defined
   attribute categories.

   category is represented as a JSON string. category MUST be present
   and it MUST be a valid selection for the chosen type.  The list of
   valid category-type combinations is mentioned above.

2.5.2.5.  to_ids

   to_ids represents whether the Attribute to be created if the
   ShadowAttribute is accepted is meant to be actionable.  Actionable
   defined attributes that can be used in automated processes as a
   pattern for detection in Local or Network Intrusion Detection System,
   log analysis tools or even filtering mechanisms.

   to_ids is represented as a JSON boolean. to_ids MUST be present.

2.5.2.6.  event_id

   event_id represents a human-readable identifier referencing the Event
   object that the ShadowAttribute belongs to.

   The event_id SHOULD be updated when the event is imported to reflect
   the newly created event's id on the instance.

   event_id is represented as a JSON string. event_id MUST be present.

2.5.2.7.  old_id

   old_id represents a human-readable identifier referencing the
   Attribute object that the ShadowAttribute belongs to.  A
   ShadowAttribute can this way target an existing Attribute, implying
   that it is a proposal to modify an existing Attribute, or




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   alternatively it can be a proposal to create a new Attribute for the
   containing Event.

   The old_id SHOULD be updated when the event is imported to reflect
   the newly created Attribute's id on the instance.  Alternatively, if
   the ShadowAttribute proposes the creation of a new Attribute, it
   should be set to 0.

   old_id is represented as a JSON string. old_id MUST be present.

2.5.2.8.  timestamp

   timestamp represents a reference time when the attribute was created
   or last modified. timestamp is expressed in seconds (decimal) since
   1st of January 1970 (Unix timestamp).  The time zone MUST be UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.

2.5.2.9.  comment

   comment is a contextual comment field.

   comment is represented by a JSON string. comment MAY be present.

2.5.2.10.  org_id

   org_id represents a human-readable identifier referencing the
   proposal creator's Organisation object.  A human-readable identifier
   MUST be represented as an unsigned integer.

   Whilst attributes can only be created by the event creator
   organisation, shadow attributes can be created by third parties.
   org_id tracks the creator organisation.

   org_id is represented by a JSON string and MUST be present.

2.5.2.11.  proposal_to_delete

   proposal_to_delete is a boolean flag that sets whether the shadow
   attribute proposes to alter an attribute, or whether it proposes to
   remove it completely.

   Accepting a shadow attribute with this flag set will remove the
   target attribute.

   proposal_to_delete is a JSON boolean and it MUST be present.  If
   proposal_to_delete is set to true, old_id MUST NOT be 0.




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2.5.2.12.  deleted

   deleted represents a setting that allows shadow attributes to be
   revoked.  Revoked shadow attributes only serve to inform other
   instances that the shadow attribute is no longer active.

   deleted is represented by a JSON boolean. deleted SHOULD be present.

2.5.2.13.  data

   data contains the base64 encoded contents of an attachment or a
   malware sample.  For malware samples, the sample MUST be encrypted
   using a password protected zip archive, with the password being
   "infected".

   data is represented by a JSON string in base64 encoding. data MUST be
   set for shadow attributes of type malware-sample and attachment.

2.5.2.14.  first_seen

   first_seen represents a reference time when the attribute was first
   seen. first_seen as an ISO 8601 datetime up to the micro-second with
   time zone support.

   first_seen is represented as a JSON string. first_seen MAY be
   present.

2.5.2.15.  last_seen

   last_seen represents a reference time when the attribute was last
   seen. last_seen as an ISO 8601 datetime up to the micro-second with
   time zone support.

   last_seen is represented as a JSON string. last_seen MAY be present.

2.5.3.  Org

   An Org object is composed of an uuid, name and id.

   The uuid represents the Universally Unique IDentifier (UUID)
   [RFC4122] of the organization.  The organization UUID is globally
   assigned to an organization and SHALL be kept overtime.

   The name is a readable description of the organization and SHOULD be
   present.  The id is a human-readable identifier generated by the
   instance and used as reference in the event.  A human-readable
   identifier MUST be represented as an unsigned integer.




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   uuid, name and id are represented as a JSON string. uuid, name and id
   MUST be present.

2.5.3.1.  Sample Org Object

          "Org": {
                  "id": "2",
                  "name": "CIRCL",
                  "uuid": "55f6ea5e-2c60-40e5-964f-47a8950d210f"
                 }

2.5.3.2.  value

   value represents the payload of an attribute.  The format of the
   value is dependent on the type of the attribute.

   value is represented by a JSON string. value MUST be present.

2.6.  Object

   Objects serve as a contextual bond between a list of attributes
   within an event.  Their main purpose is to describe more complex
   structures than can be described by a single attribute Each object is
   created using an Object Template and carries the meta-data of the
   template used for its creation within.  Objects belong to a meta-
   category and are defined by a name.

   The schema used is described by the template_uuid and
   template_version fields.

   A MISP document containing an Object MUST contain a name, a meta-
   category, a description, a template_uuid and a template_version as
   described in the "Object Attributes" section.

2.6.1.  Sample Object
















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"Object": {
   "id": "588",
   "name": "file",
   "meta-category": "file",
   "description": "File object describing a file with meta-information",
   "template_uuid": "688c46fb-5edb-40a3-8273-1af7923e2215",
   "template_version": "3",
   "event_id": "56",
   "uuid": "398b0094-0384-4c48-9bf0-22b3dff9c4d3",
   "timestamp": "1505747965",
   "distribution": "5",
   "sharing_group_id": "0",
   "comment": "",
   "deleted": false,
   "ObjectReference": [],
   "Attribute": [
     {
                 "id": "7822",
                 "type": "filename",
                 "category": "Payload delivery",
                 "to_ids": true,
                 "uuid": "59bfe3fb-bde0-4dfe-b5b1-2b10a07724d1",
                 "event_id": "56",
                 "distribution": "0",
                 "timestamp": "1505747963",
                 "comment": "",
                 "sharing_group_id": "0",
                 "deleted": false,
                 "disable_correlation": false,
                 "object_id": "588",
                 "object_relation": "filename",
                 "value": "StarCraft.exe",
                 "ShadowAttribute": [],
                 "first_seen": null,
                 "last_seen": null
     },
     "first_seen": "2019-06-02T22:14:28.711954+00:00",
     "last_seen": null
   ]
}

                                 Figure 1

2.6.2.  Object Attributes







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2.6.2.1.  uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the object.  The uuid MUST be preserved for any updates or transfer
   of the same object.  UUID version 4 is RECOMMENDED when assigning it
   to a new object.

2.6.2.2.  id

   id represents the human-readable identifier associated to the object
   for a specific MISP instance.  A human-readable identifier MUST be
   represented as an unsigned integer.

   id is represented as a JSON string. id SHALL be present.

2.6.2.3.  name

   name represents the human-readable name of the object describing the
   intent of the object package.

   name is represented as a JSON string. name MUST be present

2.6.2.4.  meta-category

   meta-category represents the sub-category of objects that the given
   object belongs to. meta-categories are not tied to a fixed list of
   options but can be created on the fly.

   meta-category is represented as a JSON string. meta-category MUST be
   present

2.6.2.5.  description

   description is a human-readable description of the given object type,
   as derived from the template used for creation.

   description is represented as a JSON string. id SHALL be present.

2.6.2.6.  template_uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the template used to create the object.  The uuid MUST be preserved
   to preserve the object's association with the correct template used
   for creation.  UUID version 4 is RECOMMENDED when assigning it to a
   new object.






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2.6.2.7.  template_version

   template_version represents a numeric incrementing version of the
   template used to create the object.  It is used to associate the
   object to the correct version of the template and together with the
   template_uuid forms an association to the correct template type and
   version.

   version is represented as a JSON string. version MUST be present.

2.6.2.8.  event_id

   event_id represents the human-readable identifier of the event that
   the object belongs to on a specific MISP instance.  A human-readable
   identifier MUST be represented as an unsigned integer.

   event_id is represented as a JSON string. event_id SHALL be present.

2.6.2.9.  timestamp

   timestamp represents a reference time when the object was created or
   last modified. timestamp is expressed in seconds (decimal) since 1st
   of January 1970 (Unix timestamp).  The time zone MUST be UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.

2.6.2.10.  distribution

   distribution represents the basic distribution rules of the object.
   The system must adhere to the distribution setting for access control
   and for dissemination of the object.

   distribution is represented by a JSON string. distribution MUST be
   present and be one of the following options:

   0
      Your Organisation Only

   1
      This Community Only

   2
      Connected Communities

   3
      All Communities

   4



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      Sharing Group

2.6.2.11.  sharing_group_id

   sharing_group_id represents a human-readable identifier referencing a
   Sharing Group object that defines the distribution of the object, if
   distribution level "4" is set.  A human-readable identifier MUST be
   represented as an unsigned integer.

   sharing_group_id is represented by a JSON string and SHOULD be
   present.  If a distribution level other than "4" is chosen the
   sharing_group_id MUST be set to "0".

2.6.2.12.  comment

   comment is a contextual comment field.

   comment is represented by a JSON string. comment MAY be present.

2.6.2.13.  deleted

   deleted represents a setting that allows attributes to be revoked.
   Revoked attributes are not actionable and exist merely to inform
   other instances of a revocation.

   deleted is represented by a JSON boolean. deleted MUST be present.

2.6.2.14.  Attribute

   Attribute is an array of attributes that describe the object with
   data.

   Each attribute in an object MUST contain the parent event's ID in the
   event_id field and the parent object's ID in the object_id field.

2.6.2.15.  first_seen

   first_seen represents a reference time when the object was first
   seen. first_seen as an ISO 8601 datetime up to the micro-second with
   time zone support.

   first_seen is represented as a JSON string. first_seen MAY be
   present.








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2.6.2.16.  last_seen

   last_seen represents a reference time when the object was last seen.
   last_seen as an ISO 8601 datetime up to the micro-second with time
   zone support.

   last_seen is represented as a JSON string. last_seen MAY be present.

2.7.  Object References

   Object References serve as a logical link between an Object and
   another referenced Object or Attribute.  The relationship is
   categorised by an enumerated value from a fixed vocabulary.

   The relationship_type is recommended to be taken from the MISP object
   relationship list [[MISP-R]] is RECOMMENDED to ensure a coherent
   naming of the tags

   All Object References MUST contain an object_uuid, a referenced_uuid
   and a relationship type.

2.7.1.  Sample ObjectReference object

"ObjectReference": {
                    "id": "195",
                    "uuid": "59c21a2c-c0ac-4083-93b3-363da07724d1",
                    "timestamp": "1505892908",
                    "object_id": "591",
                    "event_id": "113",
                    "referenced_id": "590",
                    "referenced_type": "1",
                    "relationship_type": "derived-from",
                    "comment": "",
                    "deleted": false,
                    "object_uuid": "59c1134d-8a40-4c14-ad94-0f7ba07724d1",
                    "referenced_uuid": "59c1133c-9adc-4d06-a34b-0f7ca07724d1",
                   }

2.7.2.  ObjectReference Attributes

2.7.2.1.  uuid

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the object reference.  The uuid MUST be preserved for any updates or
   transfer of the same object reference.  UUID version 4 is RECOMMENDED
   when assigning it to a new object reference.





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2.7.2.2.  id

   id represents the human-readable identifier associated to the object
   reference for a specific MISP instance.

   id is represented as a JSON string. id SHALL be present.

2.7.2.3.  timestamp

   timestamp represents a reference time when the object was created or
   last modified. timestamp is expressed in seconds (decimal) since 1st
   of January 1970 (Unix timestamp).  The time zone MUST be UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.

2.7.2.4.  object_id

   object_id represents the human-readable identifier of the object that
   the object reference belongs to on a specific MISP instance.  A
   human-readable identifier MUST be represented as an unsigned integer.

   event_id is represented as a JSON string. event_id SHALL be present.

2.7.2.5.  event_id

   event_id represents the human-readable identifier of the event that
   the object reference belongs to on a specific MISP instance.  A
   human-readable identifier MUST be represented as an unsigned integer.

   event_id is represented as a JSON string. event_id SHALL be present.

2.7.2.6.  referenced_id

   referenced_id represents the human-readable identifier of the object
   or attribute that the parent object of the object reference points to
   on a specific MISP instance.

   referenced_id is represented as a JSON string. referenced_id MAY be
   present.

2.7.2.7.  referenced_type

   referenced_type represents the numeric value describing what the
   object reference points to, "0" representing an attribute and "1"
   representing an object

   referenced_type is represented as a JSON string. referenced_type MAY
   be present.



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2.7.2.8.  relationship_type

   relationship_type represents the human-readable context of the
   relationship between an object and another object or attribute as
   described by the object_reference.

   referenced_type is represented as a JSON string. relationship_type
   MUST be present.

2.7.2.9.  comment

   comment is a contextual comment field.

   comment is represented by a JSON string. comment MAY be present.

2.7.2.10.  deleted

   deleted represents a setting that allows object references to be
   revoked.  Revoked object references are not actionable and exist
   merely to inform other instances of a revocation.

   deleted is represented by a JSON boolean. deleted MUST be present.

2.7.2.11.  object_uuid

   object_uuid represents the Universally Unique IDentifier (UUID)
   [RFC4122] of the object that the given object reference belongs to.
   The object_uuid MUST be preserved to preserve the object reference's
   association with the object.

2.7.2.12.  referenced_uuid

   referenced_uuid represents the Universally Unique IDentifier (UUID)
   [RFC4122] of the object or attribute that is being referenced by the
   object reference.  The referenced_uuid MUST be preserved to preserve
   the object reference's association with the object or attribute.

2.8.  EventReport

   EventReport are used to complement an event with one or more report
   in Markdown format.  The EventReport contains unstructured
   information which can be linked to Attributes, Objects, Tags or
   Galaxy with an extension to the Markdown marking language.








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2.8.1.  id

   id represents the human-readable identifier associated to the
   EventReport for a specific MISP instance.  A human-readable
   identifier MUST be represented as an unsigned integer.

   id is represented as a JSON string. id SHALL be present.

2.8.2.  UUID

   uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
   the EventReport.  The uuid MUST be preserved for any updates or
   transfer of the same EventReport.  UUID version 4 is RECOMMENDED when
   assigning it to a new EventReport.

   uuid is represented as a JSON string. uuid MUST be present.

2.8.3.  event_id

   event_id represents the human-readable identifier associating the
   EventReport to an event on a specific MISP instance.  A human-
   readable identifier MUST be represented as an unsigned integer.

   event_id is represented as a JSON string. event_id MUST be present.

2.8.4.  name

   name represents the information field of the EventReport. name is a
   free-text value to provide a human-readable summary of the report.
   name SHOULD NOT be bigger than 256 characters and SHOULD NOT include
   new-lines.

   name is represented as a JSON string. name MUST be present.

2.8.5.  content

   content includes the raw EventReport in Markdown format with or
   without the specific MISP Markdown markup extension.

   The markdown extension for MISP is composed with a symbol as prefix
   then between square bracket the scope (attribute, object, tag or
   galaxymatrix) followed by the UUID in parenthesis.

   content is represented as a JSON string. content MUST be present.







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2.8.6.  distribution

   distribution represents the basic distribution rules of the
   EventReport.  The system must adhere to the distribution setting for
   access control and for dissemination of the EventReport.

   distribution is represented by a JSON string. distribution MUST be
   present and be one of the following options:

   0
      Your Organisation Only

   1
      This Community Only

   2
      Connected Communities

   3
      All Communities

   4
      Sharing Group

   5
      Inherit Event

2.8.7.  sharing_group_id

   sharing_group_id represents the local id to the MISP local instance
   of the Sharing Group associated for the distribution.

   sharing_group_id is represented by a JSON string. sharing_group_id
   MUST be present and set to "0" if not used.

2.8.8.  timestamp

   timestamp represents a reference time when the EventReport was
   created or last modified. timestamp is expressed in seconds (decimal)
   since 1st of January 1970 (Unix timestamp).  The time zone MUST be
   UTC.

   timestamp is represented as a JSON string. timestamp MUST be present.








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2.8.9.  deleted

   deleted represents a setting that allows EventReport to be revoked.
   Revoked EventReport are not actionable and exist merely to inform
   other instances of a revocation.

   deleted is represented by a JSON boolean. deleted MUST be present.

2.9.  Tag

   A tag is a simple method to classify an event with a simple string.
   The tag name can be freely chosen.  The tag name can be also chosen
   from a fixed machine-tag vocabulary called MISP taxonomies[[MISP-T]].
   When an event is distributed outside an organisation, the use of MISP
   taxonomies[[MISP-T]] is RECOMMENDED to ensure a coherent naming of
   the tags.  A tag is represented as a JSON array where each element
   describes each tag associated.  A tag array SHALL be at event level
   or attribute level.  A tag element is described with a name, id,
   colour and exportable flag.

   exportable represents a setting if the tag is kept local or
   exportable to other MISP instances. exportable is represented by a
   JSON boolean. id is a human-readable identifier that references the
   tag on the local instance. colour represents an RGB value of the tag.

   name MUST be present. colour, id and exportable SHALL be present.

2.9.1.  Sample Tag

                       "Tag": [{
                               "exportable": true,
                               "colour": "#ffffff",
                               "name": "tlp:white",
                               "id": "2" }]

2.10.  Sighting

   A sighting is an ascertainment which describes whether an attribute
   has been seen under a given set of conditions.  The sighting can
   include the organisation who sighted the attribute or can be
   anonymised.  Sighting is composed of a JSON array in which each
   element describes one singular instance of a sighting.  A sighting
   element is a JSON object composed of the following values:

   type MUST be present. type describes the type of a sighting.  MISP
   allows 3 default types:





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   +------------+------------------------------------------------------+
   |  Sighting  |                     Description                      |
   |    type    |                                                      |
   +------------+------------------------------------------------------+
   |     0      |       denotes an attribute which has been seen       |
   |     1      |     denotes an attribute which has been seen and     |
   |            |             confirmed as false-positive              |
   |     2      |  denotes an attribute which will be expired at the   |
   |            |                 time of the sighting                 |
   +------------+------------------------------------------------------+

   uuid MUST be present. uuid references the uuid of the sighted
   attribute.

   date_sighting MUST be present. date_sighting is expressed in seconds
   (decimal) elapsed since 1st of January 1970 (Unix timestamp).
   date_sighting represents when the referenced attribute, designated by
   its uuid, is sighted.

   source MAY be present. source is represented as a JSON string and
   represents the human-readable version of the sighting source, which
   can be a given piece of software (e.g.  SIEM), device or a specific
   analytical process.

   id, event_id and attribute_id MAY be present.

   id represents the human-readable identifier of the sighting reference
   which belongs to a specific MISP instance.  event_id represents the
   human-readable identifier of the event referenced by the sighting and
   belongs to a specific MISP instance.  attribute_id represents the
   human-readable identifier of the attribute referenced by the sighting
   and belongs to a specific MISP instance.

   org_id MAY be present along the JSON object describing the
   organisation.  If the org_id is not present, the sighting is
   considered as anonymised.

   org_id represents the human-readable identifier of the organisation
   which did the sighting and belongs to a specific MISP instance.

   A human-readable identifier MUST be represented as an unsigned
   integer.

2.10.1.  Sample Sighting







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"Sighting": [
                   {
                                "id": "13599",
                                "attribute_id": "1201615",
                                "event_id": "10164",
                                "org_id": "2",
                                "date_sighting": "1517581400",
                                "uuid": "5a747459-41b4-4826-9b29-42dd950d210f",
                                "source": "M2M-CIRCL",
                                "type": "0",
                                "Organisation": {
                                        "id": "2",
                                        "uuid": "55f6ea5e-2c60-40e5-964f-47a8950d210f",
                                        "name": "CIRCL"
                                }
                        },
                        {
                                "id": "13601",
                                "attribute_id": "1201615",
                                "event_id": "10164",
                                "org_id": "2",
                                "date_sighting": "1517581401",
                                "uuid": "5a74745a-a190-4d04-b719-4916950d210f",
                                "source": "M2M-CIRCL",
                                "type": "0",
                                "Organisation": {
                                        "id": "2",
                                        "uuid": "55f6ea5e-2c60-40e5-964f-47a8950d210f",
                                        "name": "CIRCL"
                                }
                        }
                ]

2.11.  Galaxy

   A galaxy is a simple method to express a large object called cluster
   that can be attached to MISP events.  A cluster can be composed of
   one or more elements.  Elements are expressed as key-values.

2.11.1.  Sample Galaxy











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"Galaxy": [ {
           "id": "18",
           "uuid": "698774c7-8022-42c4-917f-8d6e4f06ada3",
           "name": "Threat Actor",
           "type": "threat-actor",
           "description": "Threat actors are characteristics of malicious actors
                          (or adversaries) representing a cyber attack threat
                          including presumed intent and historically observed behaviour.",
                "version": "1",
        "GalaxyCluster": [
            {
                "id": "1699",
                "uuid": "7cdff317-a673-4474-84ec-4f1754947823",
                "type": "threat-actor",
                "value": "Anunak",
                "tag_name": "misp-galaxy:threat-actor=\"Anunak\"",
                "description": "Groups targeting financial organizations
                    or people with significant financial assets.",
                "galaxy_id": "18",
                "source": "MISP Project",
                "authors": [
                    "Alexandre Dulaunoy",
                    "Florian Roth",
                    "Thomas Schreck",
                    "Timo Steffens",
                    "Various"
                ],
                "tag_id": "111",
                        "meta": {
                            "synonyms": [
                                "Carbanak",
                                "Carbon Spider"
                            ],
                            "country": [
                                "RU"
                            ],
                            "motive": [
                                "Cybercrime"
                            ]
                        }
                    }
                ]
            }
        ]







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3.  JSON Schema

   The JSON Schema [JSON-SCHEMA] below defines the structure of the MISP
   core format as literally described before.  The JSON Schema is used
   to validate MISP events at creation time or parsing.

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Validator for misp events",
   "id": "https://github.com/MISP/MISP/blob/2.4/format/2.4/schema.json",
   "defs": {
     "org": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         }
       },
       "required": [
         "uuid"
       ]
     },
     "orgc": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         }
       },
       "required": [
         "uuid"
       ]
     },
     "sharing_group": {



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       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "releasability": {
           "type": "string"
         },
         "description": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "organisation_uuid": {
           "type": "string"
         },
         "org_id": {
           "type": "string"
         },
         "sync_user_id": {
           "type": "string"
         },
         "active": {
           "type": "boolean"
         },
         "created": {
           "type": "string"
         },
         "modified": {
           "type": "string"
         },
         "local": {
           "type": "boolean"
         },
         "roaming": {
           "type": "boolean"
         },
         "Organisation": {
           "$ref": "#/defs/org"
         },
         "SharingGroupOrg": {
           "type": "array",
           "uniqueItems": true,



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           "items": {
             "$ref": "#/defs/sharing_group_org"
           }
         },
         "SharingGroupServer": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/sharing_group_server"
           }
         },
         "required": [
           "uuid"
         ]
       },
       "required": [
         "uuid"
       ]
     },
     "sharing_group_org": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "sharing_group_id": {
           "type": "string"
         },
         "org_id": {
           "type": "string"
         },
         "extend": {
           "type": "boolean"
         },
         "Organisation": {
           "$ref": "#/defs/org"
         }
       }
     },
     "sharing_group_server": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "sharing_group_id": {



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           "type": "string"
         },
         "server_id": {
           "type": "string"
         },
         "all_orgs": {
           "type": "boolean"
         },
         "Server": {
           "$ref": "#/defs/server"
         }
       }
     },
     "server": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "url": {
           "type": "string"
         },
         "name": {
           "type": "string"
         }
       }
     },
     "object": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "uuid": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "event_id": {
           "type": "string"
         },
         "description": {
           "type": "string"
         },
         "template_uuid": {
           "type": "string"
         },
         "template_version": {



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           "type": "string"
         },
         "id": {
           "type": "string"
         },
         "meta-category": {
           "type": "string"
         },
         "deleted": {
           "type": "boolean"
         },
         "timestamp": {
           "type": "string"
         },
         "first_seen": {
           "type": "string"
         },
         "last_seen": {
           "type": "string"
         },
         "distribution": {
           "type": "string"
         },
         "sharing_group_id": {
           "type": "string"
         },
         "comment": {
           "type": "string"
         },
         "ObjectReference": {
             "type": "array",
             "uniqueItems": true,
             "items": {
               "$ref": "#/defs/objectreference"
             }
         },
         "Attribute": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/attribute"
           }
         }
       }
     },
     "sighthing": {
       "type": "object",
       "additionalProperties": false,



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       "properties": {
         "id": {
           "type": "string"
         },
         "attribute_id": {
           "type": "string"
         },
         "event_id": {
           "type": "string"
         },
         "source": {
           "type": "string"
         },
         "type": {
           "type": "string"
         },
         "org_id": {
           "type": "string"
         },
         "date_sighting": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "Organisation": {
             "$ref": "#/defs/organisation"
         }
       }
     },
     "organisation": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "name": {
           "type": "string"
         }
       }
     },
     "objectreference": {
       "type": "object",
       "additionalProperties": false,



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       "properties": {
         "deleted": {
           "type": "boolean"
         },
         "object_id": {
           "type": "string"
         },
         "event_id": {
           "type": "string"
         },
         "timestamp": {
           "type": "string"
         },
         "id": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "type": {
           "type": "string"
         },
         "referenced_id": {
           "type": "string"
         },
         "referenced_uuid": {
           "type": "string"
         },
         "referenced_type": {
           "type": "string"
         },
         "relationship_type": {
           "type": "string"
         },
         "object_uuid": {
           "type": "string"
         },
         "comment": {
           "type": "string"
         },
         "Object": {
           "$ref": "#/defs/object"
         }
       }
     },
     "attribute": {
       "type": "object",
       "additionalProperties": false,



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       "properties": {
         "id": {
           "type": "string"
         },
         "old_id": {
           "type": "string"
         },
         "type": {
           "type": "string"
         },
         "category": {
           "type": "string"
         },
         "to_ids": {
           "type": "boolean"
         },
         "uuid": {
           "type": "string"
         },
         "event_id": {
           "type": "string"
         },
         "event_uuid": {
           "type": "string"
         },
         "proposal_to_delete": {
           "type": "boolean"
         },
         "validationIssue": {
           "type": "boolean"
         },
         "Org": {
           "$ref": "#/defs/organisation"
         },
         "org_id": {
           "type": "string"
         },
         "distribution": {
           "type": "string"
         },
         "timestamp": {
           "type": "string"
         },
         "first_seen": {
           "type": "string"
         },
         "last_seen": {
           "type": "string"



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         },
         "comment": {
           "type": "string"
         },
         "sharing_group_id": {
           "type": "string"
         },
         "deleted": {
           "type": "boolean"
         },
         "disable_correlation": {
           "type": "boolean"
         },
         "value": {
           "type": "string"
         },
         "data": {
           "type": "string"
         },
         "object_relation": {
           "type": ["string", "null"]
         },
         "object_id": {
           "type": "string"
         },
         "SharingGroup": {
           "$ref": "#/defs/sharing_group"
         },
         "ShadowAttribute": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/attribute"
           }
         },
         "Sighting": {
             "type": "array",
             "uniqueItems": true,
             "items": {
               "$ref": "#/defs/sighthing"
             }
         },
         "Galaxy": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/galaxy"
           }



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         },
         "Tag": {
           "uniqueItems": true,
           "type": "array",
           "items": {
             "$ref": "#/defs/tag"
           }
         }
       }
     },
     "event": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "orgc_id": {
           "type": "string"
         },
         "org_id": {
           "type": "string"
         },
         "date": {
           "type": "string"
         },
         "extends_uuid": {
             "type": "string"
         },
         "threat_level_id": {
           "type": "string"
         },
         "info": {
           "type": "string"
         },
         "published": {
           "type": "boolean"
         },
         "uuid": {
           "type": "string"
         },
         "attribute_count": {
           "type": "string"
         },
         "analysis": {
           "type": "string"
         },
         "timestamp": {



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           "type": "string"
         },
         "distribution": {
           "type": "string"
         },
         "proposal_email_lock": {
           "type": "boolean"
         },
         "locked": {
           "type": "boolean"
         },
         "publish_timestamp": {
           "type": "string"
         },
         "sharing_group_id": {
           "type": "string"
         },
         "disable_correlation": {
           "type": "boolean"
         },
         "event_creator_email": {
           "type": "string"
         },
         "Org": {
           "$ref": "#/defs/org"
         },
         "Orgc": {
           "$ref": "#/defs/org"
         },
         "SharingGroup": {
           "$ref": "#/defs/sharing_group"
         },
         "Attribute": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/attribute"
           }
         },
         "ShadowAttribute": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/attribute"
           }
         },
         "RelatedEvent": {
           "type": "array",



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           "uniqueItems": true,
           "items": {
             "type": "object",
             "additionalProperties": false,
             "properties": {
                 "Event":{
                   "$ref": "#/defs/event"
                 }
             }
           }
         },
         "Galaxy": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/galaxy"
           }
         },
         "Object": {
             "type": "array",
             "uniqueItems": true,
             "items": {
                 "$ref": "#/defs/object"
             }
         },
         "Tag": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/tag"
           }
         }
       }
     },
     "tag": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "colour": {
           "type": "string"
         },
         "exportable": {



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           "type": "boolean"
         },
         "hide_tag": {
           "type": "boolean"
         },
         "user_id": {
           "type": "string"
         }
       }
     },
     "galaxy": {
       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "name": {
           "type": "string"
         },
         "type": {
           "type": "string"
         },
         "description": {
           "type": "string"
         },
         "version": {
           "type": "string"
         },
         "icon": {
           "type": "string"
         },
         "namespace": {
           "type": "string"
         },
         "GalaxyCluster": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "$ref": "#/defs/galaxy_cluster"
           }
         }
       }
     },
     "galaxy_cluster": {



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       "type": "object",
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
         "uuid": {
           "type": "string"
         },
         "type": {
           "type": "string"
         },
         "value": {
           "type": "string"
         },
         "tag_name": {
           "type": "string"
         },
         "description": {
           "type": "string"
         },
         "galaxy_id": {
           "type": "string"
         },
         "version": {
           "type": "string"
         },
         "source": {
           "type": "string"
         },
         "authors": {
           "type": "array",
           "uniqueItems": true,
           "items": {
             "type": "string"
           }
         },
         "tag_id": {
           "type": "string"
         },
         "meta": {
           "type": "object"
         }
       }
     }
   },
   "type": "object",
   "properties": {



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     "Event": {
       "$ref": "#/defs/event"
     }
   },
   "required": [
     "Event"
   ]
 }

4.  Manifest

   MISP events can be shared over an HTTP repository, a file package or
   USB key.  A manifest file is used to provide an index of MISP events
   allowing to only fetch the recently updated files without the need to
   parse each json file.

4.1.  Format

   A manifest file is a simple JSON file named manifest.json in a
   directory where the MISP events are located.  Each MISP event is a
   file located in the same directory with the event uuid as filename
   with the json extension.

   The manifest format is a JSON object composed of a dictionary where
   the field is the uuid of the event.

   Each uuid is composed of a JSON object with the following fields
   which came from the original event referenced by the same uuid:

   o  info (MUST)

   o  Orgc object (MUST)

   o  analysis (SHALL)

   o  timestamp (MUST)

   o  date (MUST)

   o  threat_level_id (SHALL)

   In addition to the fields originating from the event, the following
   fields can be added:

   o  integrity:sha256 represents the SHA256 value in hexadecimal
      representation of the associated MISP event file to ensure
      integrity of the file.  (SHOULD)




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   o  integrity:pgp represents a detached PGP signature [RFC4880] of the
      associated MISP event file to ensure integrity of the file.
      (SHOULD)

   If a detached PGP signature is used for each MISP event, a detached
   PGP signature is a MUST to ensure integrity of the manifest file.  A
   detached PGP signature for a manifest file is a manifest.json.asc
   file containing the PGP signature.

4.1.1.  Sample Manifest

{
  "57c6ac4c-c60c-4f79-a38f-b666950d210f": {
    "info": "Malspam 2016-08-31 (.wsf in .zip) - campaign: Photo",
    "Orgc": {
      "id": "2",
      "name": "CIRCL",
      "uuid": "55f6ea5e-2c60-40e5-964f-47a8950d210f"
    },
    "analysis": "0",
    "Tag": [
      {
        "colour": "#3d7a00",
        "name": "circl:incident-classification=\"malware\""
      },
      {
        "colour": "#ffffff",
        "name": "tlp:white"
      }
    ],
    "timestamp": "1472638251",
    "date": "2016-08-31",
    "threat_level_id": "3"
  },
  "5720accd-dd28-45f8-80e5-4605950d210f": {
    "info": "Malspam 2016-04-27 - Locky",
    "Orgc": {
      "id": "2",
      "name": "CIRCL"
    },
    "analysis": "2",
    "Tag": [
      {
        "colour": "#ffffff",
        "name": "tlp:white"
      },
      {
        "colour": "#3d7a00",



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        "name": "circl:incident-classification=\"malware\""
      },
      {
        "colour": "#2c4f00",
        "name": "malware_classification:malware-category=\"Ransomware\""
      }
    ],
    "timestamp": "1461764231",
    "date": "2016-04-27",
    "threat_level_id": "3"
  }
}

5.  Implementation

   MISP format is implemented by different software including the MISP
   threat sharing platform and libraries like PyMISP [MISP-P].
   Implementations use the format as an export/import mechanism, staging
   transport format or synchronisation format as used in the MISP core
   platform.  MISP format doesn't impose any restriction on the data
   representation of the format in data-structure of other
   implementations.

6.  Security Considerations

   MISP events might contain sensitive or confidential information.
   Adequate access control and encryption measures shall be implemented
   to ensure the confidentiality of the MISP events.

   Adversaries might include malicious content in MISP events and
   attributes.  Implementation MUST consider the input of malicious
   inputs beside the standard threat information that might already
   include malicious intended inputs.

7.  Acknowledgements

   The authors wish to thank all the MISP community who are supporting
   the creation of open standards in threat intelligence sharing.  A
   special thank to Nicolas Bareil for the review of the JSON Schema.

8.  References

9.  References








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9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC4122]  Leach, P., Mealling, M., and R. Salz, "A Universally
              Unique IDentifier (UUID) URN Namespace", RFC 4122,
              DOI 10.17487/RFC4122, July 2005,
              <https://www.rfc-editor.org/info/rfc4122>.

   [RFC4880]  Callas, J., Donnerhacke, L., Finney, H., Shaw, D., and R.
              Thayer, "OpenPGP Message Format", RFC 4880,
              DOI 10.17487/RFC4880, November 2007,
              <https://www.rfc-editor.org/info/rfc4880>.

   [RFC8259]  Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
              Interchange Format", STD 90, RFC 8259,
              DOI 10.17487/RFC8259, December 2017,
              <https://www.rfc-editor.org/info/rfc8259>.

9.2.  Informative References

   [JSON-SCHEMA]
              "JSON Schema: A Media Type for Describing JSON Documents",
              2016,
              <https://tools.ietf.org/html/draft-wright-json-schema>.

   [MISP-P]   MISP, "MISP Project - Open Source Threat Intelligence
              Platform and Open Standards For Threat Information
              Sharing", <https://github.com/MISP>.

   [MISP-R]   MISP, "MISP Object Relationship Types - common vocabulary
              of relationships", <https://github.com/MISP/misp-
              objects/tree/master/relationships>.

   [MISP-T]   MISP, "MISP Taxonomies - shared and common vocabularies of
              tags", <https://github.com/MISP/misp-taxonomies>.

Authors' Addresses










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   Alexandre Dulaunoy
   Computer Incident Response Center Luxembourg
   16, bd d'Avranches
   Luxembourg  L-1160
   Luxembourg

   Phone: +352 247 88444
   Email: alexandre.dulaunoy@circl.lu


   Andras Iklody
   Computer Incident Response Center Luxembourg
   16, bd d'Avranches
   Luxembourg  L-1160
   Luxembourg

   Phone: +352 247 88444
   Email: andras.iklody@circl.lu

































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