TDL (Turla Driver Loader)

Driver loader for bypassing Windows x64 Driver Signature Enforcement

For more info see

• Defeating x64 Driver Signature Enforcement http://www.kernelmode.info/forum/viewtopic.php?f=11&t=3322
• WinNT/Turla http://www.kernelmode.info/forum/viewtopic.php?f=16&t=3193

System Requirements and limitations

• x64 Windows 7/8/8.1/10.
• TDL designed only for x64 Windows, Vista not listed as supported because it is obsolete.
• Administrative privilege is required.
• Loaded drivers MUST BE specially designed to run as "driverless".
• No SEH support for target drivers.
• No driver unloading.
• Only ntoskrnl import resolved, everything else is up to you.
• Dummy driver examples provided.

You use it at your own risk. Some lazy AV may flag this loader as malware.

Differences between DSEFix and TDL

While both DSEFix and TDL uses advantage of driver exploit they completely different on way of it use.

• DSEFix manipulate kernel variable called g_CiEnabled (Vista/7, ntoskrnl.exe) and/or g_CiOptions (8+. CI.DLL). Main advantage of DSEFix is it simplicity - you turn DSE off - load your driver (or patched one) and nothing else required. Main disadvantage of DSEFix is that on the modern version of Windows (8+) g_CiOptions variable is subject of PatchGuard (KPP) protection, which mean DSEFix is a potential BSOD-generator.
• TDL does not patch any kernel variables, which makes it friendly to PatchGuard. It uses small shellcode which maps your driver to kernel mode without involving Windows loader (and as result without triggering any parts of DSE) and executes it. This is main advantage of TDL - non invasive bypass of DSE. There are many disadvantages however - the first and main -> your driver MUST BE specially created to run as "driverless" which mean you will be unable to load any driver but only specially designed. Your driver will exist in kernel mode as executable code buffer, it won't be linked to PsLoadedModuleList, there will be other limitations. However this code will work at kernel mode and user mode application will be able communicate with it. You can load multiple drivers, of course if they are not conflict with each other.

Build

TDL comes with full source code. In order to build from source you need Microsoft Visual Studio 2015 U1 and later versions. For driver builds you need Microsoft Windows Driver Kit 8.1 and/or above.

Authors

(c) 2016 TDL Project

Credits

• R136a1
• N. Rin