{'created': '2020-10-19T19:53:10.576Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may install an older version of the operating '
                'system of a network device to weaken security.  Older '
                'operating system versions on network devices often have '
                'weaker encryption ciphers and, in general, fewer/less updated '
                'defensive features. (Citation: Cisco Synful Knock Evolution)\n'
                '\n'
                'On embedded devices, downgrading the version typically only '
                'requires replacing the operating system file in storage.  '
                'With most embedded devices, this can be achieved by '
                'downloading a copy of the desired version of the operating '
                'system file and reconfiguring the device to boot from that '
                'file on next system restart.  The adversary could then '
                'restart the device to implement the change immediately or '
                'they could wait until the next time the system restarts.\n'
                '\n'
                'Downgrading the system image to an older versions may allow '
                'an adversary to evade defenses by enabling behaviors such as '
                '[Weaken '
                'Encryption](https://attack.mitre.org/techniques/T1600).  '
                'Downgrading of a system image can be done on its own, or it '
                'can be used in conjunction with [Patch System '
                'Image](https://attack.mitre.org/techniques/T1601/001).  ',
 'external_references': [{'external_id': 'T1601.002',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1601/002'},
                         {'description': 'Graham Holmes. (2015, October 8). '
                                         'Evolution of attacks on Cisco IOS '
                                         'devices. Retrieved October 19, 2020.',
                          'source_name': 'Cisco Synful Knock Evolution',
                          'url': 'https://blogs.cisco.com/security/evolution-of-attacks-on-cisco-ios-devices'}],
 'id': 'attack-pattern--fc74ba38-dc98-461f-8611-b3dbf9978e3d',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'defense-evasion'}],
 'modified': '2025-10-24T17:49:39.331Z',
 'name': 'Downgrade System Image',
 'object_marking_refs': ['marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168'],
 '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': True,
 'x_mitre_modified_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'x_mitre_platforms': ['Network Devices'],
 'x_mitre_version': '1.1'}