title: Windows Processes Suspicious Parent Directory
author: vburov
date: 2019/02/23
description: Detect suspicious parent processes of well-known Windows processes
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_10:
        Image: '*\winlogon.exe'
    SELECTION_11:
        ParentImage: '*\SavService.exe'
    SELECTION_12:
        ParentImage: '*\System32\\*'
    SELECTION_13:
        ParentImage: '*\SysWOW64\\*'
    SELECTION_14:
        ParentImage: '*\Windows Defender\\*'
    SELECTION_15:
        ParentImage: '*\Microsoft Security Client\\*'
    SELECTION_16:
        ParentImage: '*\MsMpEng.exe'
    SELECTION_17:
        ParentImage|re: ^$
    SELECTION_2:
        Image: '*\svchost.exe'
    SELECTION_3:
        Image: '*\taskhost.exe'
    SELECTION_4:
        Image: '*\lsm.exe'
    SELECTION_5:
        Image: '*\lsass.exe'
    SELECTION_6:
        Image: '*\services.exe'
    SELECTION_7:
        Image: '*\lsaiso.exe'
    SELECTION_8:
        Image: '*\csrss.exe'
    SELECTION_9:
        Image: '*\wininit.exe'
    condition: (SELECTION_1 and (((SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10)
        and  not (SELECTION_11 or (SELECTION_12 or SELECTION_13))) and  not ((SELECTION_14
        or SELECTION_15) and SELECTION_16)) and  not (SELECTION_17))
falsepositives:
- Some security products seem to spawn these
id: 96036718-71cc-4027-a538-d1587e0006a7
level: low
logsource:
    category: process_creation
    product: windows
modified: 2020/11/28
references:
- https://securitybytes.io/blue-team-fundamentals-part-two-windows-processes-759fe15965e2
- https://www.carbonblack.com/2014/06/10/screenshot-demo-hunt-evil-faster-than-ever-with-carbon-black/
- https://www.13cubed.com/downloads/windows_process_genealogy_v2.pdf
- https://attack.mitre.org/techniques/T1036/
status: experimental
tags:
- attack.defense_evasion
- attack.t1036
- attack.t1036.003
- attack.t1036.005
yml_filename: win_proc_wrong_parent.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation