SigmaHQ/rules/windows/process_creation/win_system_exe_anomaly.yml

title: System File Execution Location Anomaly
status: experimental
description: Detects a Windows program executable started in a suspicious folder
references:
    - https://twitter.com/GelosSnake/status/934900723426439170
author: Florian Roth, Patrick Bareiss
date: 2017/11/27
tags:
    - attack.defense_evasion
    - attack.t1036
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image:
            - '*\svchost.exe'
            - '*\rundll32.exe'
            - '*\services.exe'
            - '*\powershell.exe'
            - '*\regsvr32.exe'
            - '*\spoolsv.exe'
            - '*\lsass.exe'
            - '*\smss.exe'
            - '*\csrss.exe'
            - '*\conhost.exe'
            - '*\wininit.exe'
            - '*\lsm.exe'
            - '*\winlogon.exe'
            - '*\explorer.exe'
            - '*\taskhost.exe' 
    filter:
        Image:
            - 'C:\Windows\System32\\*'
            - 'C:\Windows\SysWow64\\*'
            - 'C:\Windows\explorer.exe'
            - 'C:\Windows\winsxs\*'
    condition: selection and not filter
falsepositives:
    - Exotic software
level: high