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Credit

cr4sh - cr4sh has done something like this a few years back. A link to it can be found here.
btbd - used utils.c/.h, also helped debug/fix issues, provided suggestions.
edk2 - uefi library...

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 :|....

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.

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	✔️	✔️	✔️	⭕

Usage

Currently the project is configured in such a way where you replace bootmgfw.efi on your EFI partition with Voyager. This requires secure boot to be disabled. If by any chance Voyager crashes/something goes wrong simply reboot your computer since bootmgfw.efi is restored instantly. If there are any issues please let me know!

Simply run launch.bat as admin. Once it has executed, your pc will reboot.

@echo off
net session >nul 2>&1
if %errorLevel% == 0 (
    :: mount the efi partition to X: drive...
    mountvol X: /S
    
    :: bootmgfw is a system file so we are going to strip those attributes away...
    attrib -s -h X:\EFI\Microsoft\Boot\bootmgfw.efi
    
    :: backup bootmgfw.efi (this is needed for voyager to work since voyager restores bootmgfw.efi)
    move X:\EFI\Microsoft\Boot\bootmgfw.efi X:\EFI\Microsoft\Boot\bootmgfw.efi.backup
    
    :: copy payload and bootmgfw.efi to EFI partition...
    xcopy %~dp0bootmgfw.efi X:\EFI\Microsoft\Boot\
    xcopy %~dp0payload.dll  X:\EFI\Microsoft\Boot\

    echo press enter to reboot...
    pause
    
    :: enable hyper-v and reboot now...
    BCDEDIT /Set {current} hypervisorlaunchtype auto
    shutdown /r /t 0
) else (
    echo Failure: Please run as admin.
    pause
)

Disclaimer

If you brick your system I am not responsible... Do not run this if your system does not support UEFI.

This website [githacks.org], and its respective articles, are completely and solely for educational purposes, and its author, [_xeroxz], is neither personally responsible nor liable for neither malpractice nor unlawful behaviour based on this website’s contents. The owner of this website operates in a country where such laws as industrial-secrets-laws prohibit any legal action against any person reverse-engineering any publicly-available product, as long as it is not for monetary gain. The author [_xeroxz] of this website has not signed any written contracts that are juridically binding, as neither terms-of-services nor EULA’s are proper contracts in their respective country, essentially protecting this website completely for legal action. No content on this website infringes any copyrighted material or innovations, as reverse-engineered code goes under fair use as long as it is not being used for monetary gain.

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