Windows Credential Guard Related Registry Value Deleted - Registry — Sigma Rule

Rule metadata and linked tags

Author: Swachchhanda Shrawan Poudel (Nextron Systems). Source status: experimental; severity: high. Source dates: 2025-12-26 / not supplied.

{
  "category": "registry_delete",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 92f9ba398b3378661da84e0ee294975d88591d1139f8dac278e4909556bb16fa

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Windows Credential Guard Related Registry Value Deleted - Registry
id: d645ef86-2396-48a1-a2b6-b629ca3f57ff
related:
    - id: c17d47b7-dcd6-4109-87eb-d1817bd4cbc9
      type: similar
status: experimental
description: |
    Detects attempts to disable Windows Credential Guard by deleting registry values. Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them.
    Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation.
references:
    - https://github.com/DambergC/SaveFolder/blob/90e945eba80fae85f2d54b4616e05a44ec90c500/Cygate%20Installation%20tool%206.22/Script/OSD/OSDeployment-CredentialGuardDisable.ps1#L50
    - https://learn.microsoft.com/en-us/windows/security/identity-protection/credential-guard/configure
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-12-26
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: registry_delete
    product: windows
detection:
    selection:
        TargetObject|endswith:
            - '\DeviceGuard\EnableVirtualizationBasedSecurity'
            - '\DeviceGuard\LsaCfgFlags'
            - '\DeviceGuard\RequirePlatformSecurityFeatures'
            - '\Lsa\LsaCfgFlags'
    condition: selection
falsepositives:
    - Unlikely
level: high
regression_tests_path: regression_data/rules/windows/registry/registry_delete/registry_delete_disable_credential_guard/info.yml

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://github.com/DambergC/SaveFolder/blob/90e945eba80fae85f2d54b4616e05a44ec90c500/Cygate%20Installation%20tool%206.22/Script/OSD/OSDeployment-CredentialGuardDisable.ps1#L50
• https://learn.microsoft.com/en-us/windows/security/identity-protection/credential-guard/configure