{"id":"99cf1e02-00fb-4c0d-8375-563f978dfd37","title":"Deny Service Access Using Security Descriptor Tampering Via Sc.EXE","description":"Detects suspicious DACL modifications to deny access to a service that affects critical trustees. This can be used to hide services or make them unstoppable.","author":"Jonhnathan Ribeiro, oscd.community","status":"test","level":"high","date":"2020-10-16","modified":"2023-02-28","tags":["attack.privilege-escalation","attack.persistence","attack.t1543.003"],"technique_ids":["T1543.003"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.sans.org/blog/red-team-tactics-hiding-windows-services/","https://itconnect.uw.edu/tools-services-support/it-systems-infrastructure/msinf/other-help/understanding-sddl-syntax/","https://learn.microsoft.com/en-us/windows/win32/secauthz/sid-strings"],"source_path":"rules/windows/process_creation/proc_creation_win_sc_sdset_deny_service_access.yml","source_sha256":"d9693f7e9bccfbfc8ad45dd4d8d438346d2242d0c58ef1dcea0e873ad42e49fa","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_sc_sdset_deny_service_access.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Deny Service Access Using Security Descriptor Tampering Via Sc.EXE\nid: 99cf1e02-00fb-4c0d-8375-563f978dfd37\nrelated:\n    - id: 98c5aeef-32d5-492f-b174-64a691896d25 # Generic SD tampering\n      type: similar\n    - id: a537cfc3-4297-4789-92b5-345bfd845ad0 # Specific Technique\n      type: similar\nstatus: test\ndescription: Detects suspicious DACL modifications to deny access to a service that affects critical trustees. This can be used to hide services or make them unstoppable.\nreferences:\n    - https://www.sans.org/blog/red-team-tactics-hiding-windows-services/\n    - https://itconnect.uw.edu/tools-services-support/it-systems-infrastructure/msinf/other-help/understanding-sddl-syntax/\n    - https://learn.microsoft.com/en-us/windows/win32/secauthz/sid-strings\nauthor: Jonhnathan Ribeiro, oscd.community\ndate: 2020-10-16\nmodified: 2023-02-28\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.t1543.003\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_sc:\n        - Image|endswith: '\\sc.exe'\n        - OriginalFileName: 'sc.exe'\n    selection_sdset:\n        CommandLine|contains|all:\n            - 'sdset'\n            - 'D;' # Deny Access\n    selection_trustee:\n        CommandLine|contains:\n            - ';IU' # Interactively logged-on user\n            - ';SU' # Service logon user\n            - ';BA' # Built-in administrators\n            - ';SY' # Local system\n            - ';WD' # Everyone\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1543.003","id":"T1543.003","name":"Windows Service","page":"techniques/enterprise/T1543.003/"}],"data_path":"data/detection-rules/99cf1e02-00fb-4c0d-8375-563f978dfd37.json","kind":"sigma"}