Guide Kernel Driver Signing — Leaked EV Certificate Method

[byte_corvus]

Windows Driver Signature Enforcement (DSE) is a massive roadblock if you don't have a grand to drop on a legitimate EV certificate. While mappers like KDU or various exploit-based loaders are great, sometimes you just want a signed binary that doesn't trigger every heuristic engine on the planet. I found a method to sign your kernel-mode drivers using leaked certificates that still bypass the standard checks.

Prerequisites

1. A leaked code signing certificate (
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   ).
2. If you use your own, it must be an EV cert or issued before June 1, 2021, to be valid for kernel loading.
3. DSigntool.exe — (
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   +
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   ) the core utility for this process.

Step-by-Step Signing Process

First, you need to install the leaked certificate to your system store. Double-click the .pfx file; usually, the password is included in the filename or a nearby readme. Once installed, fire up DSigntool.exe and follow these steps:

1. Head to the third tab. This is where you manage your available certificates.
2. Press the 'A' button to bring up the selection menu. Match the settings to ensure the cert is recognized for kernel-level usage.
3. Hit the 'O' button to add it to your active list.
4. Navigate to the fourth tab. This is the actual signing area.
5. Press 'A' to add your compiled .sys driver file.
6. Select your driver from the list and hit the 'S' button.
7. Choose the option for kernel loading (usually the second button in the sub-menu).

Loading the Driver

Once the tool confirms the signature is applied, your .sys file should show a valid Digital Signature in the file properties. You can now load it manually using the Service Control Manager:

sc create MyDriver type= kernel binPath= C:\path\to\your\driver.sys
sc start MyDriver

Spoiler: Technical Notes & Troubleshooting

Why June 1, 2021?
Microsoft changed the requirements for cross-signing around this time. Older certs are often grandfathered in, which is why these leaked legacy certs are so valuable for researchers.

Revocation Risks
Keep in mind that leaked certs get revoked. If the AC (Anti-Cheat) you are targeting checks the CRL (Certificate Revocation List) or has the thumbprint blacklisted, you'll catch a ban or the driver won't load. Always test on a VM or a burner rig first.

Anti-Cheat Behavior
BattlEye and EAC often flag specific known leaked certificates. If your driver loads but you get kicked for 'Forbidden Driver', the signature is likely burned.

This is a solid alternative to using a vulnerable driver mapper if you need a persistent service or if you're working on something that requires a more 'legit' appearance to the OS.

anyone checked if this specific thumbprint is already blacklisted by Vanguard?