MITRE ATT&CK Technique
Command and Control
T1065
Description
Adversaries may conduct C2 communications over a non-standard port to bypass proxies and firewalls that have been improperly configured.
Supported Platforms
Linux
macOS
Windows
Created
April 29, 2026
Last Updated
April 29, 2026
STIX Data
{'created': '2017-05-31T21:30:53.408Z',
'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
'description': 'Adversaries may conduct C2 communications over a non-standard '
'port to bypass proxies and firewalls that have been '
'improperly configured.',
'external_references': [{'external_id': 'T1065',
'source_name': 'mitre-attack',
'url': 'https://attack.mitre.org/techniques/T1065'},
{'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--c848fcf7-6b62-4bde-8216-b6c157d48da0',
'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
'phase_name': 'command-and-control'}],
'modified': '2025-10-24T17:49:22.451Z',
'name': 'Uncommonly Used Port',
'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'}