{"id":"a5b977d6-8a81-4475-91b9-49dbfcd941f7","title":"Remove Immutable File Attribute - Auditd","description":"Detects removing immutable file attribute.","author":"Jakob Weinzettl, oscd.community","status":"test","level":"medium","date":"2019-09-23","modified":"2022-11-26","tags":["attack.defense-impairment","attack.t1222.002"],"technique_ids":["T1222.002"],"logsource":{"product":"linux","service":"auditd"},"falsepositives":["Administrator interacting with immutable files (e.g. for instance backups)."],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md"],"source_path":"rules/linux/auditd/execve/lnx_auditd_chattr_immutable_removal.yml","source_sha256":"af06d645c3ae68cd20491f379a8595a54db98792ab29cd0ed217d3ca8e4d8f9c","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/linux/auditd/execve/lnx_auditd_chattr_immutable_removal.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Remove Immutable File Attribute - Auditd\nid: a5b977d6-8a81-4475-91b9-49dbfcd941f7\nstatus: test\ndescription: Detects removing immutable file attribute.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md\nauthor: Jakob Weinzettl, oscd.community\ndate: 2019-09-23\nmodified: 2022-11-26\ntags:\n    - attack.defense-impairment\n    - attack.t1222.002\nlogsource:\n    product: linux\n    service: auditd\ndetection:\n    selection:\n        type: 'EXECVE'\n        a0|contains: 'chattr'\n        a1|contains: '-i'\n    condition: selection\nfalsepositives:\n    - Administrator interacting with immutable files (e.g. for instance backups).\nlevel: medium\nsimulation:\n    - type: atomic-red-team\n      name: Remove immutable file attribute\n      technique: T1222.002\n      atomic_guid: e7469fe2-ad41-4382-8965-99b94dd3c13f\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1222.002","id":"T1222.002","name":"Linux and Mac Permissions","page":"techniques/enterprise/T1222.002/"}],"data_path":"data/detection-rules/a5b977d6-8a81-4475-91b9-49dbfcd941f7.json","kind":"sigma"}