Suspicious Start-Process PassThru

Powershell use PassThru option to start in background

Sigma rule (View on GitHub)

 1title: Suspicious Start-Process PassThru
 2id: 0718cd72-f316-4aa2-988f-838ea8533277
 3status: test
 4description: Powershell use PassThru option to start in background
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1036.003/T1036.003.md
 7    - https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.management/Start-Process?view=powershell-5.1&viewFallbackFrom=powershell-7
 8author: frack113
 9date: 2022/01/15
10tags:
11    - attack.defense_evasion
12    - attack.t1036.003
13logsource:
14    product: windows
15    category: ps_script
16    definition: 'Requirements: Script Block Logging must be enabled'
17detection:
18    selection:
19        ScriptBlockText|contains|all:
20            - Start-Process
21            - '-PassThru '
22            - '-FilePath '
23    condition: selection
24falsepositives:
25    - Legitimate PowerShell scripts
26level: medium

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