title: UAC Bypass via Event Viewer
status: experimental
description: Detects UAC bypass method using Windows event viewer
references:
    - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/
    - https://www.hybrid-analysis.com/sample/e122bc8bf291f15cab182a5d2d27b8db1e7019e4e96bb5cdbd1dfe7446f3f51f?environmentId=100
author: Florian Roth
logsource:
    product: windows
    service: sysmon
detection:
    methregistry:
        EventID: 13
        TargetObject: 'HKEY_USERS\\*\mscfile\shell\open\command'
    methprocess:
        EventID: 1 # Migration to process_creation requires multipart YAML
        ParentImage: '*\eventvwr.exe'
    filterprocess:
        Image: '*\mmc.exe'
    condition: methregistry or ( methprocess and not filterprocess )
fields:
    - CommandLine
    - ParentCommandLine
tags:
    - attack.defense_evasion
    - attack.privilege_escalation
    - attack.t1088
falsepositives:
    - unknown
level: critical