name: Certutil exe certificate extraction
id: 337a46be-600f-11eb-ae93-0242ac130002
version: 2
date: '2022-07-15'
author: Rod Soto, Splunk
status: production
type: TTP
description: This search looks for arguments to certutil.exe indicating the manipulation
  or extraction of Certificate. This certificate can then be used to sign new authentication
  tokens specially inside Federated environments such as Windows ADFS.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '*-exportPFX*'
    Image|endswith: certutil.exe
  condition: selection1
how_to_implement: To successfully implement this search you need to be ingesting information
  on process that include the name of the process responsible for the changes from
  your endpoints into the `Endpoint` datamodel in the `Processes` node.
known_false_positives: Unless there are specific use cases, manipulating or exporting
  certificates using certutil is uncommon. Extraction of certificate has been observed
  during attacks such as Golden SAML and other campaigns targeting Federated services.
references:
- https://blog.sygnia.co/detection-and-hunting-of-golden-saml-attack
- https://strontic.github.io/xcyclopedia/library/certutil.exe-09A8A29BAA3A451713FD3D07943B4A43.html
tags:
  analytic_story:
  - Windows Persistence Techniques
  - Cloud Federated Credential Abuse
  - Living Off The Land
  asset_type: Endpoint
  confidence: 70
  impact: 90
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting export a certificate.
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 63
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/suspicious_behaviour/certutil_exe_certificate_extraction/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog