Suspicious Userinit Child Process

 1title: Suspicious Userinit Child Process
 2id: b655a06a-31c0-477a-95c2-3726b83d649d
 3status: test
 4description: Detects a suspicious child process of userinit
 5references:
 6    - https://twitter.com/SBousseaden/status/1139811587760562176
 7author: Florian Roth (Nextron Systems), Samir Bousseaden (idea)
 8date: 2019/06/17
 9modified: 2022/12/09
10tags:
11    - attack.defense_evasion
12    - attack.t1055
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        ParentImage|endswith: '\userinit.exe'
19    filter1:
20        CommandLine|contains: '\netlogon\'
21    filter2:
22        - Image|endswith: '\explorer.exe'
23        - OriginalFileName: 'explorer.exe'
24    condition: selection and not 1 of filter*
25fields:
26    - CommandLine
27    - ParentCommandLine
28falsepositives:
29    - Administrative scripts
30level: medium