NativeBypassCredGuard is a specialized tool designed to bypass Microsoft’s Credential Guard, a security feature that protects sensitive credentials like NTLM password hashes and Kerberos tickets using virtualization-based security (VBS).
This tool achieves its objective by patching the WDigest.dll file to enable plaintext credential storage in memory, allowing attackers to retrieve cleartext passwords from the LSASS process memory dump.
The tool operates by identifying a specific byte pattern (“39 ?? ?? ?? ?? 00 8b ?? ?? ?? ?? 00”) in the WDigest.dll file on disk. It then calculates memory addresses and modifies two global variables:
1 to enable plaintext credential storage.0 to disable Credential Guard.These changes ensure that credentials are stored in plaintext whenever users log in. The next time the LSASS process is dumped, it may contain these plaintext credentials.
NativeBypassCredGuard exclusively relies on NTAPI functions exported by ntdll.dll, avoiding user-mode hooks and enhancing stealth. Key NTAPI functions include:
SeDebugPrivilege for process manipulation.Additionally, the tool can optionally remap a clean version of ntdll.dll into memory to bypass user-mode hooks, further evading detection.
The tool supports two options:
Optional remapping of ntdll.dll can be specified with true or omitted for default behavior.
NativeBypassCredGuard.exe checkNativeBypassCredGuard.exe patch trueNativeBypassCredGuard demonstrates how attackers can exploit WDigest’s legacy behavior and bypass modern security mechanisms like Credential Guard.
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