{"id":"6c8fbee5-dee8-49bc-851d-c3142d02aa47","title":"Allow Service Access Using Security Descriptor Tampering Via Sc.EXE","description":"Detects suspicious DACL modifications to allow access to a service from a suspicious trustee. This can be used to override access restrictions set by previous ACLs.","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2023-02-28","modified":"2025-10-22","tags":["attack.privilege-escalation","attack.persistence","attack.t1543.003"],"technique_ids":["T1543.003"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://twitter.com/0gtweet/status/1628720819537936386","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_allow_service_changes.yml","source_sha256":"07d34b849f9aea27fd0799d184c750842f25f23f252f5a828f6398cb6efe1bce","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_sc_sdset_allow_service_changes.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Allow Service Access Using Security Descriptor Tampering Via Sc.EXE\nid: 6c8fbee5-dee8-49bc-851d-c3142d02aa47\nrelated:\n    - id: a537cfc3-4297-4789-92b5-345bfd845ad0 # Generic SD tampering\n      type: similar\nstatus: test\ndescription: Detects suspicious DACL modifications to allow access to a service from a suspicious trustee. This can be used to override access restrictions set by previous ACLs.\nreferences:\n    - https://twitter.com/0gtweet/status/1628720819537936386\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: Nasreddine Bencherchali (Nextron Systems)\ndate: 2023-02-28\nmodified: 2025-10-22\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            - 'A;' # Allow 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    filter_optional_hexnode:\n        ParentImage: 'C:\\Hexnode\\Hexnode Agent\\Current\\HexnodeAgent.exe'\n    condition: all of selection_* and not 1 of filter_optional_*\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/6c8fbee5-dee8-49bc-851d-c3142d02aa47.json","kind":"sigma"}