DLL Loaded via CertOC.EXE

Description

Detects when a user installs certificates by using CertOC.exe to loads the target DLL file.

Query · sigma

selection_img:
- Image|endswith: \certoc.exe
- OriginalFileName: CertOC.exe
selection_cli:
  CommandLine|contains|windash: ' -LoadDLL '
condition: all of selection_*

Known false positives

  • Unknown
Raw source DLL Loaded via CertOC.EXE · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: DLL Loaded via CertOC.EXE
id: 242301bc-f92f-4476-8718-78004a6efd9f
related:
    - id: 84232095-ecca-4015-b0d7-7726507ee793
      type: similar
status: test
description: Detects when a user installs certificates by using CertOC.exe to loads the target DLL file.
references:
    - https://twitter.com/sblmsrsn/status/1445758411803480072?s=20
    - https://github.com/elastic/protections-artifacts/commit/746086721fd385d9f5c6647cada1788db4aea95f#diff-fe98e74189873d6df72a15df2eaa0315c59ba9cdaca93ecd68afc4ea09194ef2
    - https://lolbas-project.github.io/lolbas/Binaries/Certoc/
author: Austin Songer @austinsonger
date: 2021-10-23
modified: 2024-03-05
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\certoc.exe'
        - OriginalFileName: 'CertOC.exe'
    selection_cli:
        CommandLine|contains|windash: ' -LoadDLL '
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

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