title: Certutil Decode in AppData
status: experimental
description: Detetcs a Microsoft certutil execution with the 'decode' sub command, which is sometimes used to decode malicious code with the built-in certutil utility
author: Florian Roth
reference: https://twitter.com/JohnLaTwC/status/835149808817991680
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        Image: 
            - '*\certutil.exe * -decode *'
            - '*\certutil.exe * -decodehex *'
    condition: selection
falsepositives:
    - unknown
level: high