ByePg hijacks the HalPrivateDispatchTable table to create a early-bugcheck hook. Utilizing this early-bugcheck hook it collects information about the exception and basically provides a simple interface to register a high-level system-wide exception handler.

A variety of kernel hooks can be implemented using this method completely bypassing PatchGuard and HVCI as it creates an entirely new attack surface, exception-based hooking, which was previously not possible in Windows kernel.

https://blog.can.ac/2019/10/19/byepg-defeating-patchguard-using-exception-hooking/

• \ByePgLib contains the base library
• \ExHook contains a standalone SYSCALL hooking example using ByePg
• \ExceptionHookingDemo demonstrates the exception handler
• \InfinityHookFix contains a sample rendering the recent InfinityHook patch by Microsoft useless
• \FreeSeh contains a SEH-via-ByePg module letting you use SEH in manual mapped images bypassing PatchGuard's inverted function table checks

There are many other things that can be done using the base library and many things can be improved, be SEH handling or BugCheck parsing, so I would really appreciate any form of contribution to this repo.