SigmaHQ/rules/windows/process_creation/win_susp_certutil_encode.yml

title: Certutil Encode
id: e62a9f0c-ca1e-46b2-85d5-a6da77f86d1a
status: experimental
description: Detects suspicious a certutil command that used to encode files, which is sometimes used for data exfiltration
references:
    - https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/certutil
    - https://unit42.paloaltonetworks.com/new-babyshark-malware-targets-u-s-national-security-think-tanks/
author: Florian Roth, Jonhnathan Ribeiro, oscd.community
date: 2019/02/24
modified: 2020/11/28
tags:
    - attack.defense_evasion
    - attack.t1027
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\certutil.exe'
        CommandLine|contains|all:
            - '-f'
            - '-encode'
    condition: selection
falsepositives:
    - unknown
level: medium