SigmaHQ/rules/windows/process_creation/sysmon_logon_scripts_userinitmprlogonscript_proc.yml

title: Logon Scripts (UserInitMprLogonScript)
id: 0a98a10c-685d-4ab0-bddc-b6bdd1d48458
status: experimental
description: Detects creation or execution of UserInitMprLogonScript persistence method
references:
    - https://attack.mitre.org/techniques/T1037/
tags:
    - attack.t1037 # an old one
    - attack.t1037.001
    - attack.persistence
author: Tom Ueltschi (@c_APT_ure)
date: 2019/01/12
modified: 2020/08/26
logsource:
    category: process_creation
    product: windows
detection:
    exec_selection:
        ParentImage|endswith: '\userinit.exe'
    exec_exclusion1:
        Image|endswith: '\explorer.exe'
    exec_exclusion2:
        CommandLine|contains:
            - 'netlogon.bat'
            - 'UsrLogon.cmd'
    create_keywords_cli:
        CommandLine|contains: 'UserInitMprLogonScript'
    condition: ( exec_selection and not exec_exclusion1 and not exec_exclusion2 ) or create_keywords_cli
falsepositives:
    - exclude legitimate logon scripts
    - penetration tests, red teaming
level: high