{'created': '2017-05-31T21:30:31.197Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may use a custom cryptographic protocol or '
                'algorithm to hide command and control traffic. A simple '
                'scheme, such as XOR-ing the plaintext with a fixed key, will '
                'produce a very weak ciphertext.\n'
                '\n'
                'Custom encryption schemes may vary in sophistication. '
                'Analysis and reverse engineering of malware samples may be '
                'enough to discover the algorithm and encryption key used.\n'
                '\n'
                'Some adversaries may also attempt to implement their own '
                'version of a well-known cryptographic algorithm instead of '
                'using a known implementation library, which may lead to '
                'unintentional errors. (Citation: F-Secure Cosmicduke)',
 'external_references': [{'external_id': 'T1024',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1024'},
                         {'description': 'F-Secure Labs. (2014, July). '
                                         'COSMICDUKE Cosmu with a twist of '
                                         'MiniDuke. Retrieved July 3, 2014.',
                          'source_name': 'F-Secure Cosmicduke',
                          'url': 'https://blog.f-secure.com/wp-content/uploads/2019/10/CosmicDuke.pdf'},
                         {'description': 'Fidelis Cybersecurity. (2015, August '
                                         '4). Looking at the Sky for a '
                                         'DarkComet. Retrieved April 5, 2016.',
                          'source_name': 'Fidelis DarkComet',
                          'url': 'https://www.fidelissecurity.com/sites/default/files/FTA_1018_looking_at_the_sky_for_a_dark_comet.pdf'},
                         {'description': 'Gardiner, J.,  Cova, M., Nagaraja, '
                                         'S. (2014, February). Command & '
                                         'Control Understanding, Denying and '
                                         'Detecting. Retrieved April 20, 2016.',
                          'source_name': 'University of Birmingham C2',
                          'url': 'https://arxiv.org/ftp/arxiv/papers/1408/1408.1136.pdf'}],
 'id': 'attack-pattern--3b3cbbe0-6ed3-4334-b543-3ddfd8c5642d',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'command-and-control'}],
 'modified': '2025-10-24T17:48:40.583Z',
 'name': 'Custom Cryptographic Protocol',
 'object_marking_refs': ['marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168'],
 'revoked': True,
 'spec_version': '2.1',
 'type': 'attack-pattern',
 'x_mitre_attack_spec_version': '3.2.0',
 'x_mitre_deprecated': False,
 'x_mitre_detection': '',
 'x_mitre_domains': ['enterprise-attack'],
 'x_mitre_is_subtechnique': False,
 'x_mitre_modified_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'x_mitre_platforms': ['Linux', 'macOS', 'Windows'],
 'x_mitre_version': '1.1'}