title: System File Execution Location Anomaly
author: Florian Roth, Patrick Bareiss, Anton Kutepov, oscd.community
date: 2017/11/27
description: Detects a Windows program executable started in a suspicious folder
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_10:
        Image: '*\csrss.exe'
    SELECTION_11:
        Image: '*\conhost.exe'
    SELECTION_12:
        Image: '*\wininit.exe'
    SELECTION_13:
        Image: '*\lsm.exe'
    SELECTION_14:
        Image: '*\winlogon.exe'
    SELECTION_15:
        Image: '*\explorer.exe'
    SELECTION_16:
        Image: '*\taskhost.exe'
    SELECTION_17:
        Image: '*\Taskmgr.exe'
    SELECTION_18:
        Image: '*\sihost.exe'
    SELECTION_19:
        Image: '*\RuntimeBroker.exe'
    SELECTION_2:
        Image: '*\svchost.exe'
    SELECTION_20:
        Image: '*\smartscreen.exe'
    SELECTION_21:
        Image: '*\dllhost.exe'
    SELECTION_22:
        Image: '*\audiodg.exe'
    SELECTION_23:
        Image: '*\wlanext.exe'
    SELECTION_24:
        Image: C:\Windows\System32\\*
    SELECTION_25:
        Image: C:\Windows\system32\\*
    SELECTION_26:
        Image: C:\Windows\SysWow64\\*
    SELECTION_27:
        Image: C:\Windows\SysWOW64\\*
    SELECTION_28:
        Image: C:\Windows\winsxs\\*
    SELECTION_29:
        Image: C:\Windows\WinSxS\\*
    SELECTION_3:
        Image: '*\rundll32.exe'
    SELECTION_30:
        Image: C:\avast! sandbox*
    SELECTION_31:
        Image: '*\SystemRoot\System32\\*'
    SELECTION_32:
        Image: C:\Windows\explorer.exe
    SELECTION_4:
        Image: '*\services.exe'
    SELECTION_5:
        Image: '*\powershell.exe'
    SELECTION_6:
        Image: '*\regsvr32.exe'
    SELECTION_7:
        Image: '*\spoolsv.exe'
    SELECTION_8:
        Image: '*\lsass.exe'
    SELECTION_9:
        Image: '*\smss.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
        or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14 or SELECTION_15
        or SELECTION_16 or SELECTION_17 or SELECTION_18 or SELECTION_19 or SELECTION_20
        or SELECTION_21 or SELECTION_22 or SELECTION_23) and  not ((SELECTION_24 or
        SELECTION_25 or SELECTION_26 or SELECTION_27 or SELECTION_28 or SELECTION_29
        or SELECTION_30) or SELECTION_31 or SELECTION_32))
falsepositives:
- Exotic software
fields:
- ComputerName
- User
- Image
id: e4a6b256-3e47-40fc-89d2-7a477edd6915
level: high
logsource:
    category: process_creation
    product: windows
modified: 2021/03/02
references:
- https://twitter.com/GelosSnake/status/934900723426439170
status: experimental
tags:
- attack.defense_evasion
- attack.t1036
yml_filename: win_system_exe_anomaly.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation