mirror of
https://github.com/MISP/misp-galaxy.git
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262 lines
8.6 KiB
Python
Executable file
262 lines
8.6 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# A simple convertor of the MITRE D3FEND to a MISP Galaxy datastructure.
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# Copyright (C) 2024 Christophe Vandeplas
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import requests
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import uuid
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from pymispgalaxies import Cluster, Galaxy
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d3fend_url = 'https://d3fend.mitre.org/ontologies/d3fend.json'
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d3fend_full_mappings_url = 'https://d3fend.mitre.org/api/ontology/inference/d3fend-full-mappings.json'
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galaxy_fname = 'mitre-d3fend.json'
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galaxy_type = "mitre-d3fend"
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galaxy_name = "MITRE D3FEND"
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galaxy_description = 'A knowledge graph of cybersecurity countermeasures.'
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galaxy_source = 'https://d3fend.mitre.org/'
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# we love eating lots of memory
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r = requests.get(d3fend_url)
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d3fend_json = r.json()
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r = requests.get(d3fend_full_mappings_url)
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d3fend_mappings_json = r.json()
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uuid_seed = '35527064-12b4-4b73-952b-6d76b9f1b1e3'
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tactics = {} # key = tactic, value = phases
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phases_ids = []
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techniques_ids = []
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techniques = []
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relations = {}
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def get_as_list(item):
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if isinstance(item, dict):
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return item.values()
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elif isinstance(item, list):
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result = []
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for i in item:
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if isinstance(i, dict):
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result += i.values()
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if isinstance(i, str):
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result.append(i)
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return result
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elif isinstance(item, str):
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return [item]
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else:
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raise ValueError(f'Unexpected type: {type(item)}')
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def is_val_in_element(val, element):
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result = False
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if isinstance(element, dict): # only one entry
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if val == element['@id']:
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return True
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elif isinstance(element, list): # multiple entries
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for e in element:
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if val == e['@id']:
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return True
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elif not element:
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pass
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else:
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raise ValueError(f'Unexpected type: {type(element)}')
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return result
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def is_element_in_list(element, lst):
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if isinstance(element, dict): # only one entry
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if element['@id'] in lst:
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return True
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elif isinstance(element, list): # multiple entries
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for e in element:
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if e['@id'] in lst:
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return True
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else:
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raise ValueError(f'Unexpected type: {type(element)}')
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def id_to_label(id):
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return data[id]['rdfs:label']
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def get_parent(item):
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# value of subClassOf starts with d3f
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if 'rdfs:subClassOf' in item:
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# if 'd3f:enables' in item:
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# parent_classes = get_as_list(item['d3f:enables'])
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# else:
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parent_classes = get_as_list(item['rdfs:subClassOf'])
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for parent_class in parent_classes:
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if parent_class.startswith('d3f'):
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return parent_class
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return None
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def find_kill_chain_of(original_item):
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# find if back in the kill chain_tactics list we built before
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parent_classes = get_as_list(original_item['rdfs:subClassOf'])
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for parent_class in parent_classes:
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if parent_class.startswith('d3f'):
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parent_class_name = id_to_label(parent_class).replace(' ', '-')
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for tactic, phases in kill_chain_tactics.items():
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if parent_class_name in phases:
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return f"{tactic}:{parent_class_name}"
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# child with one more parent in between
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for parent_class in parent_classes:
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if parent_class.startswith('d3f'):
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return find_kill_chain_of(data[parent_class])
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mitre_attack_pattern = Cluster('mitre-attack-pattern')
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def find_mitre_uuid_from_technique_id(technique_id):
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try:
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return mitre_attack_pattern.get_by_external_id(technique_id).uuid
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except KeyError:
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print("No MITRE UUID found for technique_id: ", technique_id)
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return None
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try:
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cluster = Cluster('mitre-d3fend')
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except (KeyError, FileNotFoundError):
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cluster = Cluster({
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'authors': ["MITRE"],
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'category': 'd3fend',
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'name': galaxy_name,
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'description': galaxy_description,
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'source': galaxy_source,
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'type': galaxy_type,
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'uuid': "b8bd7e45-63bf-4c44-8ab1-c81c82547380",
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'version': 0
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})
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# relationships
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for item in d3fend_mappings_json['results']['bindings']:
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d3fend_technique = item['def_tech_label']['value']
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attack_technique = item['off_tech_label']['value']
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attack_technique_id = item['off_tech']['value'].split('#')[-1]
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# print(f"Mapping: {d3fend_technique} -> {attack_technique} ({attack_technique_id})")
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dest_uuid = find_mitre_uuid_from_technique_id(attack_technique_id)
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if dest_uuid:
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rel_type = item['def_artifact_rel_label']['value']
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if d3fend_technique not in relations:
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relations[d3fend_technique] = []
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relations[d3fend_technique].append(
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{
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'dest-uuid': dest_uuid,
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'type': rel_type
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}
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)
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# first convert as dict with key = @id
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data = {}
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for item in d3fend_json['@graph']:
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data[item['@id']] = item
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# tactic
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for item in d3fend_json['@graph']:
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if is_val_in_element('d3f:DefensiveTactic', item.get('rdfs:subClassOf')):
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tactics[item['rdfs:label']] = {
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'order': item['d3f:display-order'],
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'phases': []
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}
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print(f"Tactic: {item['rdfs:label']}")
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# phases
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for item in d3fend_json['@graph']:
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if 'rdfs:subClassOf' in item:
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if is_val_in_element('d3f:DefensiveTechnique', item['rdfs:subClassOf']):
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phases_ids.append(item['@id'])
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parent = id_to_label(item['d3f:enables']['@id'])
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tactics[parent]['phases'].append(item['rdfs:label'].replace(' ', '-'))
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# print(f"Tactic: {parent} \tPhase: {item['rdfs:label']}")
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# sort the tactics based on the order
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tactics = dict(sorted(tactics.items(), key=lambda item: item[1]['order']))
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# sort the values
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kill_chain_tactics = {}
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for tactic, value in tactics.items():
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kill_chain_tactics[tactic] = sorted(value['phases'])
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# extract all parent, child and ... techniques
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seen_new = True
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while seen_new:
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seen_new = False
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for item in d3fend_json['@graph']:
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if 'rdfs:subClassOf' in item:
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element = item['rdfs:subClassOf']
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if is_element_in_list(element, phases_ids) or is_element_in_list(element, techniques_ids):
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if item['@id'] in techniques_ids:
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continue
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seen_new = True
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techniques_ids.append(item['@id'])
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if 'Memory Boundary Tracking' in item['rdfs:label']:
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print(f"Technique: {item['rdfs:label']}")
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kill_chain = find_kill_chain_of(item)
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technique = {
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'value': item['rdfs:label'],
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'description': item['d3f:definition'],
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'uuid': str(uuid.uuid5(uuid.UUID(uuid_seed), item['d3f:d3fend-id'])),
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'meta': {
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'kill_chain': [kill_chain],
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'refs': [f"https://d3fend.mitre.org/technique/{item['@id']}"],
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'external_id': item['d3f:d3fend-id']
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}
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}
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# synonyms
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if 'd3f:synonym' in item:
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technique['meta']['synonyms'] = get_as_list(item['d3f:synonym'])
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# relations
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if item['rdfs:label'] in relations:
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technique['related'] = relations[item['rdfs:label']]
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cluster.append(technique)
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print(f"Technique: {item['rdfs:label']} - {item['d3f:d3fend-id']}")
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cluster.save('mitre-d3fend')
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try:
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galaxy = Galaxy('mitre-d3fend')
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galaxy.kill_chain_order = kill_chain_tactics
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except (KeyError, FileNotFoundError):
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galaxy = Galaxy({
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'description': galaxy_description,
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'icon': "user-shield",
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'kill_chain_order': kill_chain_tactics,
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'name': galaxy_name,
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'namespace': "mitre",
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'type': galaxy_type,
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'uuid': "77d1bbfa-2982-4e0a-9238-1dae4a48c5b4",
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'version': 1
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})
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galaxy.save('mitre-d3fend')
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print("All done, please don't forget to ./jq_all_the_things.sh, commit, and then ./validate_all.sh.")
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