detection.wiki

Detection rules › Sigma

Azure Active Directory Connect credentials dump via network share

Status
experimental
Severity
high
Log source
product windows, service security
Author
mdecrevoisier
Source
github.com/mdecrevoisier/SIGMA-detection-rules

Detects scenarios where an attacker attempt to dump Azure Active Directory Connect credentials via network share.

Known false positives

  • None

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 5145: A network share object was checked to see whether client can be granted desired access.

Rule body

title: Azure Active Directory Connect credentials dump via network share
description: Detects scenarios where an attacker attempt to dump Azure Active Directory Connect credentials via network share.
references:
- https://github.com/fox-it/adconnectdump
- https://o365blog.com/post/adsync/
- https://dirkjanm.io/updating-adconnectdump-a-journey-into-dpapi/
tags:
- attack.credential_access
- attack.t1555
author: mdecrevoisier
status: experimental
logsource:
  product: windows
  service: security
detection:
  selection:
    EventID: 5145
    ShareName: '\\*\C$'
    RelativeTargetName|contains: '\Windows\ServiceProfiles\ADSync\AppData\Local\Microsoft\Credentials\'
  condition: selection
falsepositives:
- None
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
  EventID: 5145
  ShareName: '\\*\C$'
  RelativeTargetName|contains: '\Windows\ServiceProfiles\ADSync\AppData\Local\Microsoft\Credentials\'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
RelativeTargetNamematch
  • \Windows\ServiceProfiles\ADSync\AppData\Local\Microsoft\Credentials\
field:"RelativeTargetName" kind:match value:"\Windows\ServiceProfiles\ADSync\AppData\Local\Microsoft\Credentials\"
ShareNamewildcard
  • \\*\C$ corpus 7 (sigma 7)
field:"ShareName" kind:wildcard value:"\\*\C$"