Hook system calls on Windows by using Kaspersky's hypervisor

Kaspersky utilizes its hypervisor when hardware virtualization is supported for additional protection. It hooks system calls by changing IA32_LSTAR to point to its own syscall handler (which is basically a copy of KiSystemCall64) so it dispatches system calls to its own handlers (while doing initialization, it builds its own dispatch table).

This project loads klhk.sys (Kaspersky's hypervisor module) and a custom driver which interfaces with it to subvert the system and hook system calls.

While researching Kaspersky components, I thought it was an interesting idea to write a custom project that lets me hook system calls by using Kaspersky's hypervisor to take a closer look at what it is doing.

• Download Visual Studio 2019, WDK, clone this repository and build the solution.
• Make sure KasperskyHook.sys and KasperskyHookLoader.exe are in the same folder. Copy klhk.sys to \Windows\System32\drivers
• Execute KasperskyHookLoader.exe and have fun :D

If you followed the Build and Testing steps and kaspersky::hvm_init() returns C00000A3 or C000090B, try following these steps:

• Make sure Virtualization (VT-x/AMD-v) is supported and enabled.
• Check if there are any other hypervisors conflicting with klhk (such as other AVs)
• Delete all KasperskyHook-related services, cleanup registry information and reboot

If it still doesn't work, consider using a newer version of klhk.sys. More information: #4

MAKE SURE TO ENABLE TEST MODE TO TEST THIS PROJECT. IF YOU WISH TO USE IT OUTSIDE TEST MODE, USE YOUR CUSTOM DRIVER LOADER OR SIGN THE DRIVER.

NOTE: THIS ISN'T MEANT TO BE AN EASY-TO-PASTE-DETECTION-PROOF PROJECT. I JUST WROTE THIS FOR EDUCATIONAL PURPOSES SO I WON'T BE ADDING ANY HV-HARDENING OR ANTI-DETECTION CODE.