{"id":"534f2ef7-e8a2-4433-816d-c91bccde289b","title":"Explorer NOUACCHECK Flag","description":"Detects suspicious starts of explorer.exe that use the /NOUACCHECK flag that allows to run all sub processes of that newly started explorer.exe without any UAC checks","author":"Florian Roth (Nextron Systems)","status":"test","level":"high","date":"2022-02-23","modified":"2022-04-21","tags":["attack.privilege-escalation","attack.t1548.002"],"technique_ids":["T1548.002"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Domain Controller User Logon","Unknown how many legitimate software products use that method"],"references":["https://twitter.com/ORCA6665/status/1496478087244095491"],"source_path":"rules/windows/process_creation/proc_creation_win_explorer_nouaccheck.yml","source_sha256":"0b23baaae78d9f4e331ac900c0db310354e05de5dc014b5eac171d34b791ff7f","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_explorer_nouaccheck.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Explorer NOUACCHECK Flag\nid: 534f2ef7-e8a2-4433-816d-c91bccde289b\nstatus: test\ndescription: Detects suspicious starts of explorer.exe that use the /NOUACCHECK flag that allows to run all sub processes of that newly started explorer.exe without any UAC checks\nreferences:\n    - https://twitter.com/ORCA6665/status/1496478087244095491\nauthor: Florian Roth (Nextron Systems)\ndate: 2022-02-23\nmodified: 2022-04-21\ntags:\n    - attack.privilege-escalation\n    - attack.t1548.002\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\explorer.exe'\n        CommandLine|contains: '/NOUACCHECK'\n    filter_dc_logon:\n        - ParentCommandLine: 'C:\\Windows\\system32\\svchost.exe -k netsvcs -p -s Schedule'\n        - ParentImage: 'C:\\Windows\\System32\\svchost.exe' # coarse filter needed for ID 4688 Events\n    condition: selection and not 1 of filter_*\nfalsepositives:\n    - Domain Controller User Logon\n    - Unknown how many legitimate software products use that method\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1548.002","id":"T1548.002","name":"Bypass User Account Control","page":"techniques/enterprise/T1548.002/"}],"data_path":"data/detection-rules/534f2ef7-e8a2-4433-816d-c91bccde289b.json","kind":"sigma"}