Wdigest CredGuard Registry Modification

calendar Oct 26, 2022 · attack.defense_evasion attack.t1112  ·
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Detects potential malicious modification of the property value of IsCredGuardEnabled from HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest to disable Cred Guard on a system. This is usually used with UseLogonCredential to manipulate the caching credentials.

Sigma rule (View on GitHub)

 1title: Wdigest CredGuard Registry Modification
 2id: 1a2d6c47-75b0-45bd-b133-2c0be75349fd
 3status: test
 4description: |
 5  Detects potential malicious modification of the property value of IsCredGuardEnabled from
 6  HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest to disable Cred Guard on a system.
 7  This is usually used with UseLogonCredential to manipulate the caching credentials.  
 8references:
 9    - https://teamhydra.blog/2020/08/25/bypassing-credential-guard/
10author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
11date: 2019/08/25
12modified: 2021/11/27
13tags:
14    - attack.defense_evasion
15    - attack.t1112
16logsource:
17    category: registry_event
18    product: windows
19detection:
20    selection:
21        TargetObject|endswith: '\IsCredGuardEnabled'
22    condition: selection
23falsepositives:
24    - Unknown
25level: high

References

  • Bypassing Credential Guard

    In ye old days, a [hacker, red teamer, penetration tester, motivated child] would compromise a host, use an exploit to elevate or laterally move, and then Mimikatz their way to glory (ok, maybe not…


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