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Detection rules › Sigma

Protected Storage Service Access

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

Detects access to a protected_storage service over the network. Potential abuse of DPAPI to extract domain backup keys from Domain Controllers

MITRE ATT&CK coverage

TacticTechniques
Lateral Movement

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: Protected Storage Service Access
id: 45545954-4016-43c6-855e-eae8f1c369dc
status: test
description: Detects access to a protected_storage service over the network. Potential abuse of DPAPI to extract domain backup keys from Domain Controllers
references:
    - https://threathunterplaybook.com/hunts/windows/190620-DomainDPAPIBackupKeyExtraction/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-08-10
modified: 2021-11-27
tags:
    - attack.lateral-movement
    - attack.t1021.002
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5145
        ShareName|contains: 'IPC'
        RelativeTargetName: 'protected_storage'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 5145
    ShareName|contains: 'IPC'
    RelativeTargetName: 'protected_storage'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
RelativeTargetNameeq
  • protected_storage corpus 2 (sigma 1, elastic 1)
field:"RelativeTargetName" kind:eq value:"protected_storage"
ShareNamematch
  • IPC
field:"ShareName" kind:match value:"IPC"