Suspicious File Download through CertOC.EXE (via process_creation)

title: Suspicious File Download through CertOC.EXE (via process_creation)
id: 4621bffa-dd68-5d05-a7a0-c5eb1e0070dc
status: stable
description: This rule detects when a user downloads a file by using CertOC.exe
references:
    - https://attack.mitre.org/techniques/T1105/
    - https://lolbas-project.github.io/lolbas/Binaries/Certoc/
author: Huntrule Team
date: 2026-06-09
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\certoc.exe'
        - OriginalFileName: 'CertOC.exe'
    selection_cli:
        CommandLine|contains|all:
            - '-GetCACAPS'
            - 'http'
    condition: all of selection*
falsepositives:
    - Unknown
level: medium