defense_evasion_write_dac_access.toml

[metadata]
creation_date = "2023/08/15"
integration = ["system", "windows"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/10/09"

[rule]
author = ["Elastic"]
description = """
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.
"""
from = "now-119m"
interval = "60m"
index = ["winlogbeat-*", "logs-system.*", "logs-windows.*"]
language = "kuery"
license = "Elastic License v2"
name = "WRITEDAC Access on Active Directory Object"
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)
```
"""
references = [
    "https://www.blackhat.com/docs/us-17/wednesday/us-17-Robbins-An-ACE-Up-The-Sleeve-Designing-Active-Directory-DACL-Backdoors.pdf"
]
risk_score = 21
rule_id = "f5861570-e39a-4b8a-9259-abd39f84cb97"
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Active Directory", "Use Case: Active Directory Monitoring", "Rule Type: BBR"]
timestamp_override = "event.ingested"
type = "query"
building_block_type = "default"

query = '''
event.action:"Directory Service Access" and event.code:"5136" and
  winlog.event_data.AccessMask:"0x40000"
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1222"
reference = "https://attack.mitre.org/techniques/T1222/"
name = "File and Directory Permissions Modification"

[[rule.threat.technique.subtechnique]]
id = "T1222.001"
name = "Windows File and Directory Permissions Modification"
reference = "https://attack.mitre.org/techniques/T1222/001/"

[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"