KRBTGT Delegation Backdooredit

Identifies the modification of the msDS-AllowedToDelegateTo attribute to KRBTGT. Attackers can use this technique to maintain persistence to the domain by having the ability to request tickets for the KRBTGT service.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-system.*

Severity: high

Risk score: 73

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Persistence
  • Active Directory

Version: 4 (version history)

Added (Elastic Stack release): 8.1.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guideedit


Rule queryedit

event.action:modified-user-account and event.code:4738 and
winlog.event_data.AllowedToDelegateTo:*krbtgt*

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 4 (8.4.0 release)
  • Formatting only
Version 2 (8.2.0 release)
  • Formatting only