title: Windows Shell Spawning Suspicious Program
author: Florian Roth
date: 2018/04/06
description: Detects a suspicious child process of a Windows shell
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_10:
        Image: '*\certutil.exe'
    SELECTION_11:
        Image: '*\bitsadmin.exe'
    SELECTION_12:
        Image: '*\mshta.exe'
    SELECTION_13:
        CurrentDirectory: '*\ccmcache\\*'
    SELECTION_2:
        ParentImage: '*\mshta.exe'
    SELECTION_3:
        ParentImage: '*\powershell.exe'
    SELECTION_4:
        ParentImage: '*\rundll32.exe'
    SELECTION_5:
        ParentImage: '*\cscript.exe'
    SELECTION_6:
        ParentImage: '*\wscript.exe'
    SELECTION_7:
        ParentImage: '*\wmiprvse.exe'
    SELECTION_8:
        Image: '*\schtasks.exe'
    SELECTION_9:
        Image: '*\nslookup.exe'
    condition: (SELECTION_1 and ((SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7) and (SELECTION_8 or SELECTION_9 or SELECTION_10
        or SELECTION_11 or SELECTION_12)) and  not (SELECTION_13))
falsepositives:
- Administrative scripts
- Microsoft SCCM
fields:
- CommandLine
- ParentCommandLine
id: 3a6586ad-127a-4d3b-a677-1e6eacdf8fde
level: high
logsource:
    category: process_creation
    product: windows
modified: 2020/09/06
references:
- https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html
status: experimental
tags:
- attack.execution
- attack.defense_evasion
- attack.t1064
- attack.t1059.005
- attack.t1059.001
- attack.t1218
yml_filename: win_shell_spawn_susp_program.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation