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Detection rules › Sigma

VSSAudit Security Event Source Registration

Status
test
Severity
informational
Log source
product windows, service security
Author
Roberto Rodriguez @Cyb3rWard0g, Open Threat Research (OTR)
Source
github.com/SigmaHQ/sigma

Detects the registration of the security event source VSSAudit. It would usually trigger when volume shadow copy operations happen.

Known false positives

  • Legitimate use of VSSVC. Maybe backup operations. It would usually be done by C:\Windows\System32\VSSVC.exe.

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 4904: An attempt was made to register a security event source.
Security-AuditingEvent ID 4905: An attempt was made to unregister a security event source.

Rule body

title: VSSAudit Security Event Source Registration
id: e9faba72-4974-4ab2-a4c5-46e25ad59e9b
status: test
description: Detects the registration of the security event source VSSAudit. It would usually trigger when volume shadow copy operations happen.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.002/T1003.002.md#atomic-test-3---esentutlexe-sam-copy
author: Roberto Rodriguez @Cyb3rWard0g, Open Threat Research (OTR)
date: 2020-10-20
modified: 2022-04-28
tags:
    - attack.credential-access
    - attack.t1003.002
logsource:
    product: windows
    service: security
detection:
    selection:
        AuditSourceName: VSSAudit
        EventID:
            - 4904
            - 4905
    condition: selection
falsepositives:
    - Legitimate use of VSSVC. Maybe backup operations. It would usually be done by C:\Windows\System32\VSSVC.exe.
level: informational

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    AuditSourceName: VSSAudit
    EventID:
        - 4904
        - 4905

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
AuditSourceNameeq
  • VSSAudit
field:"AuditSourceName" kind:eq value:"VSSAudit"