{"id":"b655a06a-31c0-477a-95c2-3726b83d649d","title":"Suspicious Userinit Child Process","description":"Detects a suspicious child process of userinit","author":"Florian Roth (Nextron Systems), Samir Bousseaden (idea)","status":"test","level":"medium","date":"2019-06-17","modified":"2025-10-17","tags":["attack.privilege-escalation","attack.stealth","attack.t1055"],"technique_ids":["T1055"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Administrative scripts"],"references":["https://twitter.com/SBousseaden/status/1139811587760562176"],"source_path":"rules/windows/process_creation/proc_creation_win_susp_userinit_child.yml","source_sha256":"32fc3f8bff0df4efb8d837a7cbd2d4dd6f78d24f8b3c612e1c8ce7b7a5aab2fd","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_susp_userinit_child.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Userinit Child Process\nid: b655a06a-31c0-477a-95c2-3726b83d649d\nstatus: test\ndescription: Detects a suspicious child process of userinit\nreferences:\n    - https://twitter.com/SBousseaden/status/1139811587760562176\nauthor: Florian Roth (Nextron Systems), Samir Bousseaden (idea)\ndate: 2019-06-17\nmodified: 2025-10-17\ntags:\n    - attack.privilege-escalation\n    - attack.stealth\n    - attack.t1055\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith: '\\userinit.exe'\n    filter_main_netlogon:\n        CommandLine|contains: '\\netlogon\\'\n    filter_main_explorer:\n        - Image|endswith: '\\explorer.exe'\n        - OriginalFileName: 'explorer.exe'\n        - CommandLine: 'C:\\Windows\\Explorer.EXE'\n    filter_main_null:\n        Image: null\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Administrative scripts\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1055","id":"T1055","name":"Process Injection","page":"techniques/enterprise/T1055/"}],"data_path":"data/detection-rules/b655a06a-31c0-477a-95c2-3726b83d649d.json","kind":"sigma"}