Invoke-Obfuscation Via Use Rundll32 - PowerShell

Title: Invoke-Obfuscation Via Use Rundll32 - PowerShell
Status: test
Description:Detects Obfuscated Powershell via use Rundll32 in Scripts
References:
  -https://github.com/SigmaHQ/sigma/issues/1009
Author: Nikita Nazarov, oscd.community
Date: 2019-10-08
modified:2022-11-29
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|contains|all:
      -'&&'
      -'rundll32'
      -'shell32.dll'
      -'shellexec_rundll'

    ScriptBlockText|contains:
      -'value'
      -'invoke'
      -'comspec'
      -'iex'

  condition:selection_4104
Falsepositives:
  -Unknown
Level: high