SigmaHQ/rules/windows/process_creation/win_office_shell.yml

title: Microsoft Office Product Spawning Windows Shell
status: experimental
description: Detects a Windows command line executable started from Microsoft Word, Excel, Powerpoint, Publisher and Visio.
references:
    - https://www.hybrid-analysis.com/sample/465aabe132ccb949e75b8ab9c5bda36d80cf2fd503d52b8bad54e295f28bbc21?environmentId=100
    - https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html
tags:
    - attack.execution
    - attack.defense_evasion
    - attack.t1059
    - attack.t1202
author: Michael Haag, Florian Roth, Markus Neis
date: 2018/04/06
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage:
            - '*\WINWORD.EXE'
            - '*\EXCEL.EXE'
            - '*\POWERPNT.exe'
            - '*\MSPUB.exe'
            - '*\VISIO.exe'
            - '*\OUTLOOK.EXE'
        Image:
            - '*\cmd.exe'
            - '*\powershell.exe'
            - '*\wscript.exe'
            - '*\cscript.exe'
            - '*\sh.exe'
            - '*\bash.exe'
            - '*\scrcons.exe'
            - '*\schtasks.exe'
            - '*\regsvr32.exe'
            - '*\hh.exe'
            - '*\wmic.exe'
            - '*\mshta.exe'
            - '*\rundll32.exe'
            - '*\msiexec.exe'
            - '*\forfiles.exe'
            - '*\scriptrunner.exe'
            - '*\mftrace.exe'
            - '*\AppVLP.exe'
            - '*\svchost.exe'  # https://www.vmray.com/analyses/2d2fa29185ad/report/overview.html
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - unknown
level: high