Elastic Security Detection Rules

Potential Active Directory Replication Account Backdoor

Last updated 2 months ago on 2025-11-14
Created a year ago on 2024-07-10

About

Identifies the modification of the nTSecurityDescriptor attribute in a domain object with rights related to DCSync to a user/computer account. Attackers can use this backdoor to re-obtain access to hashes of any user/computer.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Credential AccessData Source: Active DirectoryUse Case: Active Directory MonitoringData Source: Windows Security Event LogsLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Credential Access (TA0006)(external, opens in a new tab or window)

↳ OS Credential Dumping (T1003)(external, opens in a new tab or window)

License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
Query (Kibana Query Language)
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
winlogbeat-*logs-system.security*logs-windows.forwarded*
Related Integrations

system(external, opens in a new tab or window)

windows(external, opens in a new tab or window)

Query
text code block:
event.code:"5136" and host.os.type:"windows" and
  winlog.event_data.AttributeLDAPDisplayName:"nTSecurityDescriptor" and
  winlog.event_data.AttributeValue : (
    (
      *1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;S-1-5-21-* and
      *1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;S-1-5-21-* and
      *89e95b76-444d-4c62-991a-0facbeda640c;;S-1-5-21-*
    )
  )

Install detection rules in Elastic Security

Detect Potential Active Directory Replication Account Backdoor in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).