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Detection rules › Sigma

AD Object WriteDAC Access

Status
test
Severity
critical
Log source
product windows, service security
Author
Roberto Rodriguez @Cyb3rWard0g
Source
github.com/SigmaHQ/sigma

Detects WRITE_DAC access to a domain object

MITRE ATT&CK coverage

TacticTechniques
Defense Impairment

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 4662: An operation was performed on an object.

Rule body

title: AD Object WriteDAC Access
id: 028c7842-4243-41cd-be6f-12f3cf1a26c7
status: test
description: Detects WRITE_DAC access to a domain object
references:
    - https://threathunterplaybook.com/hunts/windows/180815-ADObjectAccessReplication/notebook.html
    - https://threathunterplaybook.com/library/windows/active_directory_replication.html
    - https://threathunterplaybook.com/hunts/windows/190101-ADModDirectoryReplication/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-09-12
modified: 2021-11-27
tags:
    - attack.defense-impairment
    - attack.t1222.001
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4662
        ObjectServer: 'DS'
        AccessMask: '0x40000'
        ObjectType:
            - '19195a5b-6da0-11d0-afd3-00c04fd930c9'
            - 'domainDNS'
    condition: selection
falsepositives:
    - Unknown
level: critical

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 4662
    ObjectServer: 'DS'
    AccessMask: '0x40000'
    ObjectType:
        - '19195a5b-6da0-11d0-afd3-00c04fd930c9'
        - 'domainDNS'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
AccessMaskeq
  • 0x40000 corpus 2 (sigma 1, elastic 1)
field:"AccessMask" kind:eq value:"0x40000"
ObjectServereq
  • DS corpus 3 (sigma 3)
field:"ObjectServer" kind:eq value:"DS"
ObjectTypeeq
  • 19195a5b-6da0-11d0-afd3-00c04fd930c9
  • domainDNS
field:"ObjectType" kind:eq