{"id":"7d9263bd-dc47-4a58-bc92-5474abab390c","title":"Change Winevt Channel Access Permission Via Registry","description":"Detects tampering with the \"ChannelAccess\" registry key in order to change access to Windows event channel.","author":"frack113","status":"test","level":"high","date":"2022-09-17","modified":"2024-03-25","tags":["attack.defense-impairment","attack.t1685.001"],"technique_ids":["T1685.001"],"logsource":{"category":"registry_set","product":"windows"},"falsepositives":["Unknown"],"references":["https://app.any.run/tasks/77b2e328-8f36-46b2-b2e2-8a80398217ab/","https://learn.microsoft.com/en-us/windows/win32/api/winevt/","https://itconnect.uw.edu/tools-services-support/it-systems-infrastructure/msinf/other-help/understanding-sddl-syntax/"],"source_path":"rules/windows/registry/registry_set/registry_set_change_winevt_channelaccess.yml","source_sha256":"6b47af48cd92b796610088601ba148d1d1304b4eea9bb811f0636a516b80549d","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_change_winevt_channelaccess.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Change Winevt Channel Access Permission Via Registry\nid: 7d9263bd-dc47-4a58-bc92-5474abab390c\nstatus: test\ndescription: Detects tampering with the \"ChannelAccess\" registry key in order to change access to Windows event channel.\nreferences:\n    - https://app.any.run/tasks/77b2e328-8f36-46b2-b2e2-8a80398217ab/\n    - https://learn.microsoft.com/en-us/windows/win32/api/winevt/\n    - https://itconnect.uw.edu/tools-services-support/it-systems-infrastructure/msinf/other-help/understanding-sddl-syntax/\nauthor: frack113\ndate: 2022-09-17\nmodified: 2024-03-25\ntags:\n    - attack.defense-impairment\n    - attack.t1685.001\nlogsource:\n    category: registry_set\n    product: windows\ndetection:\n    selection:\n        TargetObject|contains: '\\Microsoft\\Windows\\CurrentVersion\\WINEVT\\Channels\\'\n        TargetObject|endswith: '\\ChannelAccess'\n        # Add more interesting combinations if you found them\n        Details|contains:\n            - '(A;;0x1;;;LA)' # Local administrator having GENERIC ALL\n            - '(A;;0x1;;;SY)' # Local System having GENERIC ALL\n            - '(A;;0x5;;;BA)' # Built-in administrators having GENERIC ALL and  GENERIC WRITE\n    filter_main_trustedinstaller:\n        Image: 'C:\\Windows\\servicing\\TrustedInstaller.exe'\n    filter_main_tiworker:\n        Image|startswith: 'C:\\Windows\\WinSxS\\'\n        Image|endswith: '\\TiWorker.exe'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1685.001","id":"T1685.001","name":"Disable or Modify Windows Event Log","page":"techniques/enterprise/T1685.001/"}],"data_path":"data/detection-rules/7d9263bd-dc47-4a58-bc92-5474abab390c.json","kind":"sigma"}