Modification of the msPKIAccountCredentials

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Identify the modification of the msPKIAccountCredentials attribute in an Active Directory User Object. Attackers can abuse the credentials roaming feature to overwrite an arbitrary file for privilege escalation. ms-PKI-AccountCredentials contains binary large objects (BLOBs) of encrypted credential objects from the credential manager store, private keys, certificates, and certificate requests.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-system.*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Data Source: Active Directory
  • Tactic: Privilege Escalation
  • Use Case: Active Directory Monitoring

Version: 8

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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event.action:"Directory Service Changes" and event.code:"5136" and
  winlog.event_data.AttributeLDAPDisplayName:"msPKIAccountCredentials" and winlog.event_data.OperationType:"%%14674" and
  not winlog.event_data.SubjectUserSid : "S-1-5-18"

Framework: MITRE ATT&CKTM