LoFP / false positives will be generated based on normal certificates issued. leave enabled to generate risk, as this is meant to be an anomaly analytic.

Techniques

• T1649

Sample rules

Windows Steal Authentication Certificates Certificate Issued

• source: splunk
• technicques:
  • T1649

Description

The following analytic identifies the issuance of a new certificate by Certificate Services - AD CS, detected via Event ID 4887. This event logs the requester user context, DNS hostname of the requesting machine, and the request time. Monitoring this activity is crucial as it can indicate potential misuse of authentication certificates. If confirmed malicious, an attacker could use the issued certificate to impersonate users, escalate privileges, or maintain persistence within the environment. This detection helps in identifying and correlating suspicious certificate-related activities for further investigation.

Detection logic

`wineventlog_security`  EventCode=4887 
| stats count min(_time) as firstTime max(_time) as lastTime by dest, name, Requester, action, Attributes, Subject 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)`
| `windows_steal_authentication_certificates_certificate_issued_filter`