{"id":"9a0d8ca0-2385-4020-b6c6-cb6153ca56f3","title":"System Owner or User Discovery - Linux","description":"Detects the execution of host or user discovery utilities such as \"whoami\", \"hostname\", \"id\", etc.\nAdversaries may use the information from System Owner/User Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.\n","author":"Timur Zinniatullin, oscd.community","status":"test","level":"low","date":"2019-10-21","modified":"2025-06-04","tags":["attack.discovery","attack.t1033"],"technique_ids":["T1033"],"logsource":{"product":"linux","service":"auditd"},"falsepositives":["Admin activity"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1033/T1033.md"],"source_path":"rules/linux/auditd/execve/lnx_auditd_user_discovery.yml","source_sha256":"6a7f81c3aa7dee9a7e155720be3439a927011c2f78922ca0f3245c6bc9ab9f13","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/linux/auditd/execve/lnx_auditd_user_discovery.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: System Owner or User Discovery - Linux\nid: 9a0d8ca0-2385-4020-b6c6-cb6153ca56f3\nstatus: test\ndescription: |\n    Detects the execution of host or user discovery utilities such as \"whoami\", \"hostname\", \"id\", etc.\n    Adversaries may use the information from System Owner/User Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1033/T1033.md\nauthor: Timur Zinniatullin, oscd.community\ndate: 2019-10-21\nmodified: 2025-06-04\ntags:\n    - attack.discovery\n    - attack.t1033\nlogsource:\n    product: linux\n    service: auditd\ndetection:\n    selection:\n        type: 'EXECVE'\n        a0:\n            - 'hostname'\n            - 'id'\n            - 'last'\n            - 'uname'\n            - 'users'\n            - 'w'\n            - 'who'\n            - 'whoami'\n    condition: selection\nfalsepositives:\n    - Admin activity\nlevel: low\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1033","id":"T1033","name":"System Owner/User Discovery","page":"techniques/enterprise/T1033/"}],"data_path":"data/detection-rules/9a0d8ca0-2385-4020-b6c6-cb6153ca56f3.json","kind":"sigma"}