title: Suspicious Shells Spawn by WinRM
author: Andreas Hunkeler (@Karneades), Markus Neis
date: 2021/05/20
description: Detects suspicious shell spawn from WinRM host process
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_10:
        Image: '*\bitsadmin.exe'
    SELECTION_2:
        ParentImage: '*\wsmprovhost.exe'
    SELECTION_3:
        Image: '*\cmd.exe'
    SELECTION_4:
        Image: '*\sh.exe'
    SELECTION_5:
        Image: '*\bash.exe'
    SELECTION_6:
        Image: '*\powershell.exe'
    SELECTION_7:
        Image: '*\schtasks.exe'
    SELECTION_8:
        Image: '*\certutil.exe'
    SELECTION_9:
        Image: '*\whoami.exe'
    condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10))
falsepositives:
- Legitimate WinRM usage
id: 5cc2cda8-f261-4d88-a2de-e9e193c86716
level: high
logsource:
    category: process_creation
    product: windows
modified: 2021/05/22
status: experimental
tags:
- attack.t1190
- attack.initial_access
- attack.persistence
- attack.privilege_escalation
yml_filename: win_susp_shell_spawn_from_winrm.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_access