Sigma rule: ADCS Certificate Template Configuration Vulnerability with Risky EKU

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-b3abcb3a3b77, updated 2022-12-25T00:00:00.000Z.

Rule

Title
ADCS Certificate Template Configuration Vulnerability with Risky EKU
Status
test
Level
high
Author
Orlinum , BlueDefenZer
Date
2021-11-17
Modified
2022-12-25
File
rules/windows/builtin/security/win_security_adcs_certificate_template_configuration_vulnerability_eku.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects certificate creation with template allowing risk permission subject and risky EKU

Log source

product
windows
service
security
definition
Certificate services loaded a template would trigger event ID 4898 and certificate Services template was updated would trigger event ID 4899. A risk permission seems to be coming if template contain specific flag with risky EKU.

Detection

selection10:
    EventID: 4898
    TemplateContent|contains:
        - '1.3.6.1.5.5.7.3.2'
        - '1.3.6.1.5.2.3.4'
        - '1.3.6.1.4.1.311.20.2.2'
        - '2.5.29.37.0'
selection11:
    TemplateContent|contains: 'CT_FLAG_ENROLLEE_SUPPLIES_SUBJECT'

selection20:
    EventID: 4899
    NewTemplateContent|contains:
        - '1.3.6.1.5.5.7.3.2'
        - '1.3.6.1.5.2.3.4'
        - '1.3.6.1.4.1.311.20.2.2'
        - '2.5.29.37.0'
selection21:
    NewTemplateContent|contains: 'CT_FLAG_ENROLLEE_SUPPLIES_SUBJECT'

condition: (selection10 and selection11) or (selection20 and selection21)

False positives (as the rule lists them)

  • Administrator activity
  • Proxy SSL certificate with subject modification
  • Smart card enrollement

Tags

  • attack.privilege-escalation
  • attack.credential-access

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_adcs_certificate_template_configuration_vulnerability_eku.yml

Sources and licences

  • SigmaHQ

    "ADCS Certificate Template Configuration Vulnerability with Risky EKU" by Orlinum , BlueDefenZer (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_adcs_certificate_template_configuration_vulnerability_eku.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: ADCS Certificate Template Configuration Vulnerability with Risky EKU",
entity page, dataset version ref-b3abcb3a3b77, updated 2022-12-25T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bfbd3291-de87-4b7c-88a2-d6a5deb28668 (accessed 2026-11-03).
Underlying source: SigmaHQ rule bfbd3291-de87-4b7c-88a2-d6a5deb28668, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.