title: Detection of PowerShell Execution via DLL
author: Markus Neis
date: 2018/08/25
description: Detects PowerShell Strings applied to rundll as seen in PowerShdll.dll
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        Image: '*\rundll32.exe'
    SELECTION_3:
        Description: '*Windows-Hostprozess (Rundll32)*'
    SELECTION_4:
        CommandLine: '*Default.GetString*'
    SELECTION_5:
        CommandLine: '*FromBase64String*'
    condition: (SELECTION_1 and ((SELECTION_2) or (SELECTION_3)) and (SELECTION_4
        or SELECTION_5))
falsepositives:
- Unknown
id: 6812a10b-60ea-420c-832f-dfcc33b646ba
level: high
logsource:
    category: process_creation
    product: windows
modified: 2020/09/01
references:
- https://github.com/p3nt4/PowerShdll/blob/master/README.md
status: experimental
tags:
- attack.defense_evasion
- attack.t1085
- attack.t1218.011
yml_filename: win_powershell_dll_execution.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation