IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
KRBTGT Delegation Backdoor
editKRBTGT Delegation Backdoor
editIdentifies 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
editSetup
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
editevent.action:modified-user-account and event.code:4738 and winlog.event_data.AllowedToDelegateTo:*krbtgt*
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Account Manipulation
- ID: T1098
- Reference URL: https://attack.mitre.org/techniques/T1098/
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Steal or Forge Kerberos Tickets
- ID: T1558
- Reference URL: https://attack.mitre.org/techniques/T1558/