Detection rules › Sigma

Certificate Private Key Acquired

Status
test
Severity
medium
Log source
product windows, service capi2
Author
Zach Mathis
Source
github.com/SigmaHQ/sigma

Detects when an application acquires a certificate private key

MITRE ATT&CK coverage

TacticTechniques
Credential AccessT1649 Steal or Forge Authentication Certificates

Event coverage

Rule body yaml

title: Certificate Private Key Acquired
id: e2b5163d-7deb-4566-9af3-40afea6858c3
status: test
description: Detects when an application acquires a certificate private key
references:
    - https://www.splunk.com/en_us/blog/security/breaking-the-chain-defending-against-certificate-services-abuse.html
author: Zach Mathis
date: 2023-05-13
tags:
    - attack.credential-access
    - attack.t1649
logsource:
    product: windows
    service: capi2
    definition: 'Requirements: The CAPI2 Operational log needs to be enabled'
detection:
    selection:
        EventID: 70 # Acquire Certificate Private Key
    condition: selection
falsepositives:
    - Legitimate application requesting certificate exports will trigger this. Apply additional filters as needed
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 70