Voyager - A Hyper-V Hacking Framework For Windows 10 x64 (AMD & Intel)

Voyager is a project designed to offer module injection and vmexit hooking for both AMD & Intel versions of Hyper-V. This project works on all versions of Windows 10-x64 (2004-1511). The project is currently split into two individual projects, one for Intel and another for AMD.

Voyager 1 - Intel

Voyager 1 contains all the code associated with the Intel part of this project. Since intel has vmread/vmwrite instructions all that is needed is a simple hook on the vmexit handler and interception can commence.

The payload solution contains a small CPUID interception example. I plan on expanding my examples to include EPT hooking and module injection/module shadowing. I also need to locate the self referencing pml4e in hyper-v's pml4 :|....

svm::pgs_base_struct vmexit_handler(void* unknown, svm::pguest_context context)
{
	const auto vmcb = *reinterpret_cast<svm::pvmcb*>(
		*reinterpret_cast<u64*>(
			*reinterpret_cast<u64*>(
				__readgsqword(0) + offset_vmcb_base) 
					+ offset_vmcb_link) + offset_vmcb);

	if (vmcb->exitcode == VMEXIT_CPUID && context->rcx == VMEXIT_KEY)
	{
		vmcb->rax = 0xC0FFEE;
		vmcb->rip = vmcb->nrip;
		return reinterpret_cast<svm::pgs_base_struct>(__readgsqword(0));
	}

	return reinterpret_cast<svm::vcpu_run_t>(
		reinterpret_cast<u64>(&vmexit_handler) -
			svm::voyager_context.vcpu_run_rva)(unknown, context);
}

Voyager 2 - AMD

Voyager 2 contains all the code associated with the AMD part of this project. Since AMD has no vmread/vmwrite operation, only vmsave/vmload I had to locate the linear virtual address of the VMCB for every version of windows. GS register contains a pointer to a structure defined by MS, this structure contains alot of stuff. Deep in this structure is a linear virtual address to the current cores VMCB.

#if WINVER == 2004
#define offset_vmcb_base 0x103B0
#define offset_vmcb_link 0x198
#define offset_vmcb 0xE80
#elif WINVER == 1909
#define offset_vmcb_base 0x83B0
#define offset_vmcb_link 0x190
#define offset_vmcb 0xD00
#elif WINVER == 1903
#define offset_vmcb_base 0x83B0
#define offset_vmcb_link 0x190
#define offset_vmcb 0xD00
#elif WINVER == 1809
#define offset_vmcb_base 0x83B0
#define offset_vmcb_link 0x198
#define offset_vmcb 0xD00
#elif WINVER == 1803
#define offset_vmcb_base 0x82F0
#define offset_vmcb_link 0x168
#define offset_vmcb 0xCC0
#elif WINVER == 1709
#define offset_vmcb_base 0x82F0
#define offset_vmcb_link 0x88
#define offset_vmcb 0xC80
#elif WINVER == 1703
#define offset_vmcb_base 0x82F0
#define offset_vmcb_link 0x80
#define offset_vmcb 0xBC0
#elif WINVER == 1607
#define offset_vmcb_base 0x82F0
#define offset_vmcb_link 0x90
#define offset_vmcb 0xBC0
#elif WINVER == 1511
#define offset_vmcb_base 0x82F0
#define offset_vmcb_link 0x90
#define offset_vmcb 0xC40
#endif

Ill probably end up sig scanning for these offsets/resolving them at runtime when i condense this project down to a single solution.

Versions & Support

⭕ -> unknown/not tested. ✔️ -> tested & working. ❌ -> tested & not working.

Winver	AMD	Intel	VM	Bare Metal
2004	✔️	✔️	✔️	✔️
1909	✔️	✔️	✔️	⭕
1903	✔️	✔️	✔️	⭕
1809	✔️	✔️	✔️	⭕
1807	✔️	✔️	✔️	⭕
1803	✔️	✔️	✔️	⭕
1709	✔️	✔️	✔️	⭕
1703	✔️	✔️	✔️	⭕
1607	✔️	✔️	✔️	⭕
1511	✔️	✔️	✔️	⭕