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Been messing around with Vanguard bypasses lately and hit the same wall. Trying to spoof SSD serials while keeping Secure Boot enabled is basically the holy grail of Valorant bypasses right now, considering how deep their kernel-mode driver digs during the boot process.
The Technical Bottleneck:
As you noted, self-signed drivers are dead on arrival if Secure Boot is active. Using a vulnerable signed driver (like AMIDEWIN or specific manufacturer flash tools) is the common route, but Vanguard's signature validation and handle monitoring are getting aggressive. If you load it late, the damage is done because the AC has already pulled your hardware identifiers from the I/O request packets during initialization.
What I've been looking at:
Regarding your AMIFLDRV64.SYS approach:
Using a legit driver is smart, but you are right—timing is everything. If you are not hitting the memory before the AC initializes its callback routines, you are just feeding it your real data. Have you tried using a boot-start service that triggers earlier in the cycle? There are some legitimate, signed drivers related to storage controllers that you might be able to exploit if you find a vulnerability to gain an arbitrary read/write primitive.
Anyone here managed to get a signed driver to load at StartType 0 without triggering a manual ban or BSODing the system? I am curious if anyone has successfully bypassed the integrity check on the drive serials via a hypervisor hook yet.
Let me know what you guys think—is it even worth fighting the SSD serials, or are you guys having more luck targeting the MAC/GUIDs and spoofing the UUID?
The Technical Bottleneck:
As you noted, self-signed drivers are dead on arrival if Secure Boot is active. Using a vulnerable signed driver (like AMIDEWIN or specific manufacturer flash tools) is the common route, but Vanguard's signature validation and handle monitoring are getting aggressive. If you load it late, the damage is done because the AC has already pulled your hardware identifiers from the I/O request packets during initialization.
What I've been looking at:
- EFI-level spoofing: Instead of a boot-start driver, have you looked into modifying the EFI boot sequence? If you can hook the firmware calls before the Windows kernel even sees the drive controller, you might avoid the signature check issues. It is way more complex than a standard driver, but it is effectively invisible to the OS-level AC.
- DMA with custom FW: If you are running hardware, you could theoretically use a PCIe DMA device with 1:1 custom firmware to intercept the I/O requests. This bypasses the need to touch your own kernel and keeps Secure Boot happy since you are not loading any unsigned code on the host machine.
- Registry/WMI spoofing: Have you checked if Vanguard is actually hitting the physical hardware via IOCTLs or just querying the WMI/Registry classes? Sometimes they are lazy, and spoofing the reported serials in the registry is enough, though they usually cross-reference with disk geometry and SMART data.
Regarding your AMIFLDRV64.SYS approach:
Using a legit driver is smart, but you are right—timing is everything. If you are not hitting the memory before the AC initializes its callback routines, you are just feeding it your real data. Have you tried using a boot-start service that triggers earlier in the cycle? There are some legitimate, signed drivers related to storage controllers that you might be able to exploit if you find a vulnerability to gain an arbitrary read/write primitive.
Anyone here managed to get a signed driver to load at StartType 0 without triggering a manual ban or BSODing the system? I am curious if anyone has successfully bypassed the integrity check on the drive serials via a hypervisor hook yet.
Let me know what you guys think—is it even worth fighting the SSD serials, or are you guys having more luck targeting the MAC/GUIDs and spoofing the UUID?
