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# mail_to_misp
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Connect your mail infrastructure to [MISP](https://github.com/MISP/MISP) in order to create events based on the information contained within mails.
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## Features
- Extraction of URLs and IP addresses (and port numbers) from free text emails
- Extraction of hostnames from URLs
- Extraction of hashes (MD5, SHA1, SHA256)
- DNS expansion
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- Custom filter list for lines containing specific words
- Subject filters
- Respecting TLP classification mentioned in free text (including optional spelling robustness)
- Refanging of URLs ('hxxp://...')
- Add tags automatically based on key words (configurable)
- Add tags automatically depending on the presence of other tags (configurable)
- Add tags automatically depending on presence of hashes (e.g. for automatic expansion)
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- Ignore 'whitelisted' domains (configurable)
- Specify a stop word term to no further process input
- Configurable list of attributes not to enable the IDS flag
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- Automatically create 'external analysis' links based on filter list (e.g. VirusTotal, malwr.com)
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- Automatically create 'internal reference' links based on filter list
- Detection of forwarded messages
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- Process attachments as malware samples or specify that they are processed as benign files (`m2m_attachment_keyword`)
You can send mails with attachments to mail_to_misp and tell it, to treat the attachment as a benign document (in contrast to the default behaviour: treating it as a malware sample). You need to set a keyword in the configuration:
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`m2m_attachment_keyword = 'attachment:benign'`
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- Logging to syslog
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- Remove "[tags]", "Re:" and "Fwd:" from subjects
- Optionally attach entire mail to event
- Contains now a fake-smtpd spamtrap which delivers IoCs/mails to MISP
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- Automatically filter out attributes that are on a server side warning list (`enforcewarninglist=True`)
- Support for value sighting (`sighting=True`, `sighting_source="YOUR_MAIL_TO_MISP_IDENTIFIER"`)
- Auto-publish when `key:yourkey` is specified in mail (configurable, `m2m_key`, `m2m_auto_distribution`)
The `m2m_key configuration` is used to specify a secret only you and your users know. If you know the key, you can send a mail to your mail_to_misp instance, and when this key is present in the body of the message, it will automatically publish the event. So let's assume your config says: `m2m_key = 'ABCDEFGHIJKLMN0PQRSTUVWXYZ'`
If you send a mail to mail_to_misp containing: `key:ABCDEFGHIJKLMN0PQRSTUVWXYZ` the event is automatically published.
If you don't want to use this feature, just don't put it in the message body.
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The distribution is defined in the configuration as well: `m2m_auto_distribution = '3' # 3 = All communities`
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## Implementation
The implemented workflow is mainly for mail servers like Postfix. Client side implementations exist but are no longer supported:
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1. Postfix and others
`Email -> mail_to_misp`
2. Apple Mail [deprecated]
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`Email -> Apple Mail -> Mail rule -> AppleScript -> mail_to_misp -> PyMISP -> MISP`
3. Mozilla Thunderbird [deprecated]
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`Email -> Thunderbird -> Mail rule -> filterscript -> thunderbird_wrapper -> mail_to_misp -> PyMISP -> MISP`
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## Installation
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### Postfix (or other MTA) - preferred method
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1. Setup a new email address in the aliases file (e.g. /etc/aliases) and configure the correct path:
`misp_handler: "|/path/to/mail_to_misp.py"`
2. Rebuild the DB:
`$ sudo newaliases`
3. Configure mail_to_misp_config.py
You should now be able to send your IoC-containing mails to misp_handler@YOURDOMAIN.
#### Bonus: Fake-SMTPD spamtrap
If you want to process all incoming junk mails automatically and collect the contained information in a (separate?) MISP instance, you could use the fake_smtp.py script. It listens on port 25, accepts all mails and pushes them through mail_to_misp to a MISP instance.
1. Configure mail_to_misp_config.py
2. ln -s mail_to_misp_config.py fake_smtp_config.py
3. Run fake_smtp.py (as root)
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`$ sudo python3 fake_smtp.py`
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### Apple Mail [deprecated]
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1. Mail rule script
- git clone this repository
- open the AppleScript file MUA/Apple/Mail/MISP Mail Rule Action.txt in Apple's 'Script Editor'
- adjust the path to the python installation and location of the mail_to_misp.py script
- save it in ~/Library/Application Scripts/com.apple.mail/
2. Create a mail rule based on your needs, executing the AppleScript defined before
3. Configure mail_to_misp_config.py
### Thunderbird [deprecated]
1. Git clone https://github.com/rommelfs/filterscript and install plugin (instructions within the project description)
2. Mail rule script
- git clone this repository
- open the bash script MUA/Mozilla/Thunderbird/thunderbird_wrapper.sh and adujst the paths
- adjust the path to the python installation and location of the mail_to_misp.py script
3. Create a mail rule based on your needs, executing the thunderbird_wrapper.sh script
4. Configure mail_to_misp_config.py
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You should be able to create MISP events now.
### Outlook [deprecated]
Outlook is not implemented due to lack of test environment. However, it should be feasible to do it this way:
```
import win32com.client
import pythoncom
class Handler_Class(object):
def OnNewMailEx(self, receivedItemsIDs):
for ID in receivedItemsIDs.split(","):
# Microsoft.Office.Interop.Outlook _MailItem properties:
# https://msdn.microsoft.com/en-us/library/microsoft.office.interop.outlook._mailitem_properties.aspx
mailItem = outlook.Session.GetItemFromID(ID)
print "Subj: " + mailItem.Subject
print "Body: " + mailItem.Body.encode( 'ascii', 'ignore' )
print "========"
outlook = win32com.client.DispatchWithEvents("Outlook.Application", Handler_Class)
pythoncom.PumpMessages()
```
(from: https://blog.matthewurch.ca/?p=236)
Obviously, you would like to filter mails based on subject or from address and pass subject and body to mail_to_misp.py in order to do something useful. Pull-requests welcome for actual implementations :)
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## Requirements
### The easy way
```bash
# Install faup
git clone git://github.com/stricaud/faup.git
cd faup
mkdir build
cd build
cmake .. && make
sudo make install
# Update Shared libs
sudo ldconfig
# Install other python requirements
pip3 install -r requirements.txt
# Test if the script is working
./mail_to_misp.py -h
```
### General
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- mail_to_misp requires access to a MISP instance (via API).
- Python >=3.6
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- dnspython
- PyMISP
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- faup from https://github.com/stricaud/faup
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- urlmarker from https://github.com/rcompton/ryancompton.net/blob/master/assets/praw_drugs/urlmarker.py (contained in this project)
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- ftfy from https://github.com/LuminosoInsight/python-ftfy (to fix unicode text)
- defang from https://github.com/Rafiot/defang.git (fork of: https://bitbucket.org/johannestaas/defang)
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### Thunderbird [deprecated]
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- https://github.com/rommelfs/filterscript (modified fork from https://github.com/adamnew123456/filterscript)
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## License
This software is licensed under [GNU Affero General Public License version 3](http://www.gnu.org/licenses/agpl-3.0.html)
* Copyright (C) 2017, 2018 Sascha Rommelfangen, Raphaël Vinot
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* Copyright (C) 2017, 2018 CIRCL - Computer Incident Response Center Luxembourg