Invoke-Obfuscation VAR+ Launcher - Security

Title: Invoke-Obfuscation VAR+ Launcher - Security
Status: test
Description:Detects Obfuscated use of Environment Variables to execute PowerShell
References:
  -https://github.com/SigmaHQ/sigma/issues/1009
Author: Jonathan Cheong, oscd.community
Date: 2020-10-15
modified:2022-11-29
Tags:

• -'attack.stealth'
• -'attack.t1027'
• -'attack.execution'
• -'attack.t1059.001'

Logsource:

• product: windows
• service: security
• definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697

Detection:
  selection:
    EventID: '4697'
    ServiceFileName|contains|all:
      -'cmd'
      -'"set'
      -'-f'

    ServiceFileName|contains:
      -'/c'
      -'/r'

  condition:selection
Falsepositives:
  -Unknown
Level: high