{'created': '2017-05-31T21:30:35.733Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may attempt to identify the primary user, '
                'currently logged in user, set of users that commonly uses a '
                'system, or whether a user is actively using the system. They '
                'may do this, for example, by retrieving account usernames or '
                'by using [OS Credential '
                'Dumping](https://attack.mitre.org/techniques/T1003). The '
                'information may be collected in a number of different ways '
                'using other Discovery techniques, because user and username '
                'details are prevalent throughout a system and include running '
                'process ownership, file/directory ownership, session '
                'information, and system logs. Adversaries may use the '
                'information from [System Owner/User '
                'Discovery](https://attack.mitre.org/techniques/T1033) during '
                'automated discovery to shape follow-on behaviors, including '
                'whether or not the adversary fully infects the target and/or '
                'attempts specific actions.\n'
                '\n'
                'Various utilities and commands may acquire this information, '
                'including <code>whoami</code>. In macOS and Linux, the '
                'currently logged in user can be identified with '
                '<code>w</code> and <code>who</code>. On macOS the <code>dscl '
                ". list /Users | grep -v '_'</code> command can also be used "
                'to enumerate user accounts. Environment variables, such as '
                '<code>%USERNAME%</code> and <code>$USER</code>, may also be '
                'used to access this information.\n'
                '\n'
                'On network devices, [Network Device '
                'CLI](https://attack.mitre.org/techniques/T1059/008) commands '
                'such as `show users` and `show ssh` can be used to display '
                'users currently logged into the device.(Citation: '
                'show_ssh_users_cmd_cisco)(Citation: US-CERT TA18-106A Network '
                'Infrastructure Devices 2018)',
 'external_references': [{'external_id': 'T1033',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1033'},
                         {'description': 'Cisco. (2023, March 7). Cisco IOS '
                                         'Security Command Reference: Commands '
                                         'S to Z . Retrieved July 13, 2022.',
                          'source_name': 'show_ssh_users_cmd_cisco',
                          'url': 'https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/security/s1/sec-s1-cr-book/sec-cr-s5.html'},
                         {'description': 'US-CERT. (2018, April 20). Russian '
                                         'State-Sponsored Cyber Actors '
                                         'Targeting Network Infrastructure '
                                         'Devices. Retrieved October 19, 2020.',
                          'source_name': 'US-CERT TA18-106A Network '
                                         'Infrastructure Devices 2018',
                          'url': 'https://us-cert.cisa.gov/ncas/alerts/TA18-106A'}],
 'id': 'attack-pattern--03d7999c-1f4c-42cc-8373-e7690d318104',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'discovery'}],
 'modified': '2025-10-24T17:48:20.366Z',
 'name': 'System Owner/User Discovery',
 'object_marking_refs': ['marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168'],
 'revoked': False,
 'spec_version': '2.1',
 'type': 'attack-pattern',
 'x_mitre_attack_spec_version': '3.2.0',
 'x_mitre_contributors': ['Austin Clark, @c2defense'],
 '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', 'Network Devices', 'Windows'],
 'x_mitre_version': '1.6'}

---

---

---

---