mirror of https://github.com/MISP/misp-modules
chrisr3d
4 years ago
parent
f541b1f4ba
commit
74b73f9332
3 changed files with 332 additions and 324 deletions
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all = ['joe_parser'] |
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# -*- coding: utf-8 -*- |
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from collections import defaultdict |
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from datetime import datetime |
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from pymisp import MISPAttribute, MISPEvent, MISPObject |
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import json |
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|
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domain_object_mapping = {'@ip': ('ip-dst', 'ip'), '@name': ('domain', 'domain')} |
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dropped_file_mapping = {'@entropy': ('float', 'entropy'), |
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'@file': ('filename', 'filename'), |
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'@size': ('size-in-bytes', 'size-in-bytes'), |
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'@type': ('mime-type', 'mimetype')} |
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dropped_hash_mapping = {'MD5': 'md5', 'SHA': 'sha1', 'SHA-256': 'sha256', 'SHA-512': 'sha512'} |
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file_object_fields = ['filename', 'md5', 'sha1', 'sha256', 'sha512', 'ssdeep'] |
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file_object_mapping = {'entropy': ('float', 'entropy'), |
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'filesize': ('size-in-bytes', 'size-in-bytes'), |
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'filetype': ('mime-type', 'mimetype')} |
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file_references_mapping = {'fileCreated': 'creates', 'fileDeleted': 'deletes', |
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'fileMoved': 'moves', 'fileRead': 'reads', 'fileWritten': 'writes'} |
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network_behavior_fields = ('srcip', 'dstip', 'srcport', 'dstport') |
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network_connection_object_mapping = {'srcip': ('ip-src', 'ip-src'), 'dstip': ('ip-dst', 'ip-dst'), |
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'srcport': ('port', 'src-port'), 'dstport': ('port', 'dst-port')} |
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pe_object_fields = {'entrypoint': ('text', 'entrypoint-address'), |
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'imphash': ('imphash', 'imphash')} |
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pe_object_mapping = {'CompanyName': 'company-name', 'FileDescription': 'file-description', |
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'FileVersion': 'file-version', 'InternalName': 'internal-filename', |
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'LegalCopyright': 'legal-copyright', 'OriginalFilename': 'original-filename', |
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'ProductName': 'product-filename', 'ProductVersion': 'product-version', |
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'Translation': 'lang-id'} |
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process_object_fields = {'cmdline': 'command-line', 'name': 'name', |
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'parentpid': 'parent-pid', 'pid': 'pid', |
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'path': 'current-directory'} |
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protocols = {'tcp': 4, 'udp': 4, 'icmp': 3, |
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'http': 7, 'https': 7, 'ftp': 7} |
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section_object_mapping = {'characteristics': ('text', 'characteristic'), |
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'entropy': ('float', 'entropy'), |
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'name': ('text', 'name'), 'rawaddr': ('hex', 'offset'), |
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'rawsize': ('size-in-bytes', 'size-in-bytes'), |
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'virtaddr': ('hex', 'virtual_address'), |
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'virtsize': ('size-in-bytes', 'virtual_size')} |
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registry_references_mapping = {'keyValueCreated': 'creates', 'keyValueModified': 'modifies'} |
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regkey_object_mapping = {'name': ('text', 'name'), 'newdata': ('text', 'data'), |
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'path': ('regkey', 'key')} |
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signerinfo_object_mapping = {'sigissuer': ('text', 'issuer'), |
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'version': ('text', 'version')} |
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|
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class JoeParser(): |
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def __init__(self, data): |
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self.data = data |
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self.misp_event = MISPEvent() |
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self.references = defaultdict(list) |
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self.attributes = defaultdict(lambda: defaultdict(set)) |
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self.process_references = {} |
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|
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def parse_joe(self): |
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if self.analysis_type() == "file": |
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self.parse_fileinfo() |
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else: |
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self.parse_url_analysis() |
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self.parse_system_behavior() |
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self.parse_network_behavior() |
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self.parse_network_interactions() |
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self.parse_dropped_files() |
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if self.attributes: |
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self.handle_attributes() |
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if self.references: |
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self.build_references() |
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self.parse_mitre_attack() |
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self.finalize_results() |
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|
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def build_references(self): |
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for misp_object in self.misp_event.objects: |
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object_uuid = misp_object.uuid |
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if object_uuid in self.references: |
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for reference in self.references[object_uuid]: |
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misp_object.add_reference(reference['idref'], reference['relationship']) |
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|
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def handle_attributes(self): |
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for attribute_type, attribute in self.attributes.items(): |
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for attribute_value, references in attribute.items(): |
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attribute_uuid = self.create_attribute(attribute_type, attribute_value) |
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for reference in references: |
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source_uuid, relationship = reference |
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self.references[source_uuid].append({'idref': attribute_uuid, 'relationship': relationship}) |
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def parse_dropped_files(self): |
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droppedinfo = self.data['droppedinfo'] |
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if droppedinfo: |
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for droppedfile in droppedinfo['hash']: |
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file_object = MISPObject('file') |
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for key, mapping in dropped_file_mapping.items(): |
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attribute_type, object_relation = mapping |
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file_object.add_attribute(object_relation, **{'type': attribute_type, 'value': droppedfile[key]}) |
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if droppedfile['@malicious'] == 'true': |
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file_object.add_attribute('state', **{'type': 'text', 'value': 'Malicious'}) |
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for h in droppedfile['value']: |
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hash_type = dropped_hash_mapping[h['@algo']] |
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file_object.add_attribute(hash_type, **{'type': hash_type, 'value': h['$']}) |
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self.misp_event.add_object(**file_object) |
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self.references[self.process_references[(int(droppedfile['@targetid']), droppedfile['@process'])]].append({ |
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'idref': file_object.uuid, |
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'relationship': 'drops' |
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}) |
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|
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def parse_mitre_attack(self): |
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mitreattack = self.data['mitreattack'] |
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if mitreattack: |
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for tactic in mitreattack['tactic']: |
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if tactic.get('technique'): |
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for technique in tactic['technique']: |
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self.misp_event.add_tag('misp-galaxy:mitre-attack-pattern="{} - {}"'.format(technique['name'], technique['id'])) |
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def parse_network_behavior(self): |
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network = self.data['behavior']['network'] |
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connections = defaultdict(lambda: defaultdict(set)) |
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for protocol, layer in protocols.items(): |
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if network.get(protocol): |
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for packet in network[protocol]['packet']: |
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timestamp = datetime.strptime(self.parse_timestamp(packet['timestamp']), '%B %d, %Y %H:%M:%S.%f') |
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connections[tuple(packet[field] for field in network_behavior_fields)][protocol].add(timestamp) |
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for connection, data in connections.items(): |
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attributes = self.prefetch_attributes_data(connection) |
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if len(data.keys()) == len(set(protocols[protocol] for protocol in data.keys())): |
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network_connection_object = MISPObject('network-connection') |
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for object_relation, attribute in attributes.items(): |
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network_connection_object.add_attribute(object_relation, **attribute) |
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network_connection_object.add_attribute('first-packet-seen', |
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**{'type': 'datetime', 'value': min(tuple(min(timestamp) for timestamp in data.values()))}) |
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for protocol in data.keys(): |
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network_connection_object.add_attribute('layer{}-protocol'.format(protocols[protocol]), **{'type': 'text', 'value': protocol}) |
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self.misp_event.add_object(**network_connection_object) |
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self.references[self.analysisinfo_uuid].append({'idref': network_connection_object.uuid, 'relationship': 'initiates'}) |
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else: |
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for protocol, timestamps in data.items(): |
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network_connection_object = MISPObject('network-connection') |
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for object_relation, attribute in attributes.items(): |
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network_connection_object.add_attribute(object_relation, **attribute) |
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network_connection_object.add_attribute('first-packet-seen', **{'type': 'datetime', 'value': min(timestamps)}) |
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network_connection_object.add_attribute('layer{}-protocol'.format(protocols[protocol]), **{'type': 'text', 'value': protocol}) |
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self.misp_event.add_object(**network_connection_object) |
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self.references[self.analysisinfo_uuid].append({'idref': network_connection_object.uuid, 'relationship': 'initiates'}) |
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def parse_system_behavior(self): |
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system = self.data['behavior']['system'] |
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if system.get('processes'): |
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process_activities = {'fileactivities': self.parse_fileactivities, |
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'registryactivities': self.parse_registryactivities} |
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for process in system['processes']['process']: |
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general = process['general'] |
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process_object = MISPObject('process') |
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for feature, relation in process_object_fields.items(): |
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process_object.add_attribute(relation, **{'type': 'text', 'value': general[feature]}) |
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start_time = datetime.strptime('{} {}'.format(general['date'], general['time']), '%d/%m/%Y %H:%M:%S') |
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process_object.add_attribute('start-time', **{'type': 'datetime', 'value': start_time}) |
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self.misp_event.add_object(**process_object) |
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for field, to_call in process_activities.items(): |
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to_call(process_object.uuid, process[field]) |
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self.references[self.analysisinfo_uuid].append({'idref': process_object.uuid, 'relationship': 'calls'}) |
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self.process_references[(general['targetid'], general['path'])] = process_object.uuid |
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def parse_fileactivities(self, process_uuid, fileactivities): |
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for feature, files in fileactivities.items(): |
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# ignore unknown features |
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if feature not in file_references_mapping: |
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continue |
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if files: |
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for call in files['call']: |
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self.attributes['filename'][call['path']].add((process_uuid, file_references_mapping[feature])) |
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def analysis_type(self): |
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generalinfo = self.data['generalinfo'] |
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if generalinfo['target']['sample']: |
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return "file" |
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elif generalinfo['target']['url']: |
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return "url" |
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else: |
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raise Exception("Unknown analysis type") |
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def parse_url_analysis(self): |
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generalinfo = self.data["generalinfo"] |
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url_object = MISPObject("url") |
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self.analysisinfo_uuid = url_object.uuid |
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url_object.add_attribute("url", generalinfo["target"]["url"]) |
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self.misp_event.add_object(**url_object) |
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def parse_fileinfo(self): |
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fileinfo = self.data['fileinfo'] |
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file_object = MISPObject('file') |
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self.analysisinfo_uuid = file_object.uuid |
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for field in file_object_fields: |
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file_object.add_attribute(field, **{'type': field, 'value': fileinfo[field]}) |
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for field, mapping in file_object_mapping.items(): |
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attribute_type, object_relation = mapping |
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file_object.add_attribute(object_relation, **{'type': attribute_type, 'value': fileinfo[field]}) |
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if not fileinfo.get('pe'): |
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self.misp_event.add_object(**file_object) |
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return |
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peinfo = fileinfo['pe'] |
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pe_object = MISPObject('pe') |
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file_object.add_reference(pe_object.uuid, 'included-in') |
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self.misp_event.add_object(**file_object) |
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for field, mapping in pe_object_fields.items(): |
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attribute_type, object_relation = mapping |
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pe_object.add_attribute(object_relation, **{'type': attribute_type, 'value': peinfo[field]}) |
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pe_object.add_attribute('compilation-timestamp', **{'type': 'datetime', 'value': int(peinfo['timestamp'].split()[0], 16)}) |
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program_name = fileinfo['filename'] |
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if peinfo['versions']: |
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for feature in peinfo['versions']['version']: |
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name = feature['name'] |
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if name == 'InternalName': |
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program_name = feature['value'] |
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if name in pe_object_mapping: |
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pe_object.add_attribute(pe_object_mapping[name], **{'type': 'text', 'value': feature['value']}) |
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sections_number = len(peinfo['sections']['section']) |
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pe_object.add_attribute('number-sections', **{'type': 'counter', 'value': sections_number}) |
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signatureinfo = peinfo['signature'] |
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if signatureinfo['signed']: |
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signerinfo_object = MISPObject('authenticode-signerinfo') |
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pe_object.add_reference(signerinfo_object.uuid, 'signed-by') |
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self.misp_event.add_object(**pe_object) |
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signerinfo_object.add_attribute('program-name', **{'type': 'text', 'value': program_name}) |
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for feature, mapping in signerinfo_object_mapping.items(): |
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attribute_type, object_relation = mapping |
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signerinfo_object.add_attribute(object_relation, **{'type': attribute_type, 'value': signatureinfo[feature]}) |
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self.misp_event.add_object(**signerinfo_object) |
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else: |
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self.misp_event.add_object(**pe_object) |
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for section in peinfo['sections']['section']: |
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section_object = self.parse_pe_section(section) |
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self.references[pe_object.uuid].append({'idref': section_object.uuid, 'relationship': 'included-in'}) |
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self.misp_event.add_object(**section_object) |
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def parse_network_interactions(self): |
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domaininfo = self.data['domaininfo'] |
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if domaininfo: |
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for domain in domaininfo['domain']: |
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domain_object = MISPObject('domain-ip') |
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for key, mapping in domain_object_mapping.items(): |
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attribute_type, object_relation = mapping |
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domain_object.add_attribute(object_relation, **{'type': attribute_type, 'value': domain[key]}) |
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self.misp_event.add_object(**domain_object) |
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self.references[self.process_references[(int(domain['@targetid']), domain['@currentpath'])]].append({ |
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'idref': domain_object.uuid, |
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'relationship': 'contacts' |
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}) |
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ipinfo = self.data['ipinfo'] |
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if ipinfo: |
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for ip in ipinfo['ip']: |
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attribute = MISPAttribute() |
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attribute.from_dict(**{'type': 'ip-dst', 'value': ip['@ip']}) |
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self.misp_event.add_attribute(**attribute) |
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self.references[self.process_references[(int(ip['@targetid']), ip['@currentpath'])]].append({ |
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'idref': attribute.uuid, |
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'relationship': 'contacts' |
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}) |
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urlinfo = self.data['urlinfo'] |
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if urlinfo: |
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for url in urlinfo['url']: |
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target_id = int(url['@targetid']) |
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current_path = url['@currentpath'] |
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attribute = MISPAttribute() |
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attribute_dict = {'type': 'url', 'value': url['@name']} |
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if target_id != -1 and current_path != 'unknown': |
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self.references[self.process_references[(target_id, current_path)]].append({ |
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'idref': attribute.uuid, |
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'relationship': 'contacts' |
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}) |
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else: |
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attribute_dict['comment'] = 'From Memory - Enriched via the joe_import module' |
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attribute.from_dict(**attribute_dict) |
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self.misp_event.add_attribute(**attribute) |
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def parse_pe_section(self, section): |
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section_object = MISPObject('pe-section') |
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for feature, mapping in section_object_mapping.items(): |
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attribute_type, object_relation = mapping |
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section_object.add_attribute(object_relation, **{'type': attribute_type, 'value': section[feature]}) |
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return section_object |
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def parse_registryactivities(self, process_uuid, registryactivities): |
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if registryactivities['keyCreated']: |
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for call in registryactivities['keyCreated']['call']: |
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self.attributes['regkey'][call['path']].add((process_uuid, 'creates')) |
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for feature, relationship_type in registry_references_mapping.items(): |
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if registryactivities[feature]: |
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for call in registryactivities[feature]['call']: |
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registry_key = MISPObject('registry-key') |
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for field, mapping in regkey_object_mapping.items(): |
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attribute_type, object_relation = mapping |
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registry_key.add_attribute(object_relation, **{'type': attribute_type, 'value': call[field]}) |
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registry_key.add_attribute('data-type', **{'type': 'text', 'value': 'REG_{}'.format(call['type'].upper())}) |
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self.misp_event.add_object(**registry_key) |
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self.references[process_uuid].append({'idref': registry_key.uuid, 'relationship': relationship_type}) |
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def create_attribute(self, attribute_type, attribute_value): |
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attribute = MISPAttribute() |
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attribute.from_dict(**{'type': attribute_type, 'value': attribute_value}) |
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self.misp_event.add_attribute(**attribute) |
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return attribute.uuid |
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def finalize_results(self): |
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event = json.loads(self.misp_event.to_json())['Event'] |
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self.results = {key: event[key] for key in ('Attribute', 'Object') if (key in event and event[key])} |
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@staticmethod |
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def parse_timestamp(timestamp): |
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timestamp = timestamp.split(':') |
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timestamp[-1] = str(round(float(timestamp[-1].split(' ')[0]), 6)) |
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return ':'.join(timestamp) |
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@staticmethod |
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def prefetch_attributes_data(connection): |
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attributes = {} |
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for field, value in zip(network_behavior_fields, connection): |
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attribute_type, object_relation = network_connection_object_mapping[field] |
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attributes[object_relation] = {'type': attribute_type, 'value': value} |
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return attributes |
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