PowerShell Get-Process LSASS in ScriptBlock

Description

Detects a Get-Process command on lsass process, which is in almost all cases a sign of malicious activity

Query · sigma

selection:
  ScriptBlockText|contains: Get-Process lsass
condition: selection

Known false positives

  • Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)
Raw source PowerShell Get-Process LSASS in ScriptBlock · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: PowerShell Get-Process LSASS in ScriptBlock
id: 84c174ab-d3ef-481f-9c86-a50d0b8e3edb
status: test
description: Detects a Get-Process command on lsass process, which is in almost all cases a sign of malicious activity
references:
    - https://web.archive.org/web/20220205033028/https://twitter.com/PythonResponder/status/1385064506049630211
author: Florian Roth (Nextron Systems)
date: 2021-04-23
modified: 2022-12-25
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: 'Get-Process lsass'
    condition: selection
falsepositives:
    - Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)
level: high

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