Invoke-Obfuscation Via Stdin - Powershell

Title: Invoke-Obfuscation Via Stdin - Powershell
Status: test
Description:Detects Obfuscated Powershell via Stdin in Scripts
References:
  -https://github.com/SigmaHQ/sigma/issues/1009
Author: Nikita Nazarov, oscd.community
Date: 2020-10-12
modified:2024-04-05
Tags:

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

Logsource:

• product: windows
• category: ps_script
• definition: Requirements: Script Block Logging must be enabled

Detection:
  selection_4104:
    ScriptBlockText|re: '(?i)(set).*&&\s?set.*(environment|invoke|\$\{?input).*&&.*"'
  condition:selection_4104
Falsepositives:
  -Unknown
Level: high