IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Kerberos Preauthentication Disabled for User
editKerberos Preauthentication Disabled for User
editIdentifies the modification of account Kerberos preauthentication options. An adversary with GenericWrite/GenericAll rights over the account can maliciously modify these settings to perform offline password cracking attacks such as AS-REP roasting.
Rule type: query
Rule indices:
- winlogbeat-*
- logs-windows.*
- logs-system.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://www.harmj0y.net/blog/activedirectory/roasting-as-reps
- https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4738
- https://github.com/atc-project/atomic-threat-coverage/blob/master/Atomic_Threat_Coverage/Logging_Policies/LP_0026_windows_audit_user_account_management.md
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Credential Access
Version: 1
Added (Elastic Stack release): 8.1.0
Rule authors: Elastic
Rule license: Elastic License v2
Investigation guide
edit## Config 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.code:4738 and message:"'Don't Require Preauth' - Enabled"
Threat mapping
editFramework: MITRE ATT&CKTM
-
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/