SigmaHQ/rules/windows/powershell/powershell_invoke_obfuscation_via_rundll.yml

title: Invoke-Obfuscation RUNDLL LAUNCHER
id: e6cb92b4-b470-4eb8-8a9d-d63e8583aae0
description: Detects Obfuscated Powershell via RUNDLL LAUNCHER
status: experimental
author: Timur Zinniatullin, oscd.community
date: 2020/10/18
references:
    - https://github.com/Neo23x0/sigma/issues/1009 #(Task 23)
tags:
    - attack.defense_evasion
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    service: powershell
    definition: Script block logging must be enabled for 4104, Module Logging must be enabled for 4103
detection:
    selection_1:
        EventID: 4104
        ScriptBlockText|re: '(?i).*rundll32(?:\.exe)?(?:\s+)?shell32\.dll.*shellexec_rundll.*powershell.*\"'
    selection_2:
        EventID: 4103
        Payload|re: '(?i).*rundll32(?:\.exe)?(?:\s+)?shell32\.dll.*shellexec_rundll.*powershell.*\"'
    condition: 1 of them
falsepositives:
    - Unknown
level: medium