{'created': '2020-07-01T18:23:25.002Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may use port knocking to hide open ports used for '
                'persistence or command and control. To enable a port, an '
                'adversary sends a series of attempted connections to a '
                'predefined sequence of closed ports. After the sequence is '
                'completed, opening a port is often accomplished by the host '
                'based firewall, but could also be implemented by custom '
                'software.\n'
                '\n'
                'This technique has been observed both for the dynamic opening '
                'of a listening port as well as the initiating of a connection '
                'to a listening server on a different system.\n'
                '\n'
                'The observation of the signal packets to trigger the '
                'communication can be conducted through different methods. One '
                'means, originally implemented by Cd00r (Citation: Hartrell '
                'cd00r 2002), is to use the libpcap libraries to sniff for the '
                'packets in question. Another method leverages raw sockets, '
                'which enables the malware to use ports that are already open '
                'for use by other programs.',
 'external_references': [{'external_id': 'T1205.001',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1205/001'},
                         {'description': 'Hartrell, Greg. (2002, August). Get '
                                         'a handle on cd00r: The invisible '
                                         'backdoor. Retrieved October 13, '
                                         '2018.',
                          'source_name': 'Hartrell cd00r 2002',
                          'url': 'https://www.giac.org/paper/gcih/342/handle-cd00r-invisible-backdoor/103631'}],
 'id': 'attack-pattern--8868cb5b-d575-4a60-acb2-07d37389a2fd',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'defense-evasion'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'persistence'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'command-and-control'}],
 'modified': '2025-10-24T17:49:04.301Z',
 'name': 'Port Knocking',
 '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': ['Linux', 'macOS', 'Windows', 'Network Devices'],
 'x_mitre_version': '1.2'}