IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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WRITEDAC Access on Active Directory Object

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WRITEDAC Access on Active Directory Object

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Identifies the access on an object with WRITEDAC permissions. With the WRITEDAC permission, the user can perform a Write Discretionary Access Control List (WriteDACL) operation, which is used to modify the access control rules associated with a specific object within Active Directory. Attackers may abuse this privilege to grant themselves or other compromised accounts additional rights, ultimately compromising the target object, resulting in privilege escalation, lateral movement, and persistence.

Rule type: query

Rule indices:

winlogbeat-*
logs-system.security*
logs-windows.*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://www.blackhat.com/docs/us-17/wednesday/us-17-Robbins-An-ACE-Up-The-Sleeve-Designing-Active-Directory-DACL-Backdoors.pdf

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Active Directory
Use Case: Active Directory Monitoring
Rule Type: BBR
Data Source: System

Version: 7

Rule authors:

Elastic

Rule license: Elastic License v2

Setup

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Setup

The Audit Directory Service Access 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 >
DS Access >
Audit Directory Service Access (Success,Failure)

Rule query

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host.os.type: "windows" and event.action : ("Directory Service Access" or "object-operation-performed") and
  event.code : "4662" and winlog.event_data.AccessMask:"0x40000"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: File and Directory Permissions Modification
- ID: T1222
- Reference URL: https://attack.mitre.org/techniques/T1222/
Sub-technique:
- Name: Windows File and Directory Permissions Modification
- ID: T1222.001
- Reference URL: https://attack.mitre.org/techniques/T1222/001/

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