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Elastic Docs ›Elastic Security Solution [8.11] ›Detections and alerts ›Prebuilt rule reference

KRBTGT Delegation Backdoor

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IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

KRBTGT Delegation Backdoor

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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.*
  • logs-windows.*

Severity: high

Risk score: 73

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
  • Tactic: Persistence
  • Use Case: Active Directory Monitoring
  • Data Source: Active Directory

Version: 107

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setup

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Setup

The Audit User Account Management logging policy must be configured for (Success, Failure). Steps to implement the logging policy with Advanced Audit Configuration:

Computer Configuration >
Policies >
Windows Settings >
Security Settings >
Advanced Audit Policies Configuration >
Audit Policies >
Account Management >
Audit User Account Management (Success,Failure)

Rule query

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

Framework: MITRE ATT&CKTM

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