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Detection rules › Sigma

DPAPI Domain Backup Key Extraction

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

Detects tools extracting LSA secret DPAPI domain backup key from Domain Controllers

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

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

Rule body

title: DPAPI Domain Backup Key Extraction
id: 4ac1f50b-3bd0-4968-902d-868b4647937e
status: test
description: Detects tools extracting LSA secret DPAPI domain backup key from Domain Controllers
references:
    - https://threathunterplaybook.com/hunts/windows/190620-DomainDPAPIBackupKeyExtraction/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-06-20
modified: 2022-02-24
tags:
    - attack.credential-access
    - attack.t1003.004
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4662
        ObjectType: 'SecretObject'
        AccessMask: '0x2'
        ObjectName|contains: 'BCKUPKEY'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 4662
    ObjectType: 'SecretObject'
    AccessMask: '0x2'
    ObjectName|contains: 'BCKUPKEY'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
AccessMaskeq
  • 0x2 corpus 2 (sigma 2)
field:"AccessMask" kind:eq value:"0x2"
ObjectNamematch
  • BCKUPKEY
field:"ObjectName" kind:match value:"BCKUPKEY"
ObjectTypeeq
  • SecretObject
field:"ObjectType" kind:eq value:"SecretObject"