NoImportz ( By: Th3Spl )

So, i was reading a blog post about cheat detections from anti-cheats ( ACs )
specifically Detecting manually mapped drivers written by SamuelTulach
so after reading it i came up with a very simple solution...
I highly suggest to read the article before checking this project out.

So, it's very easy and straightforward but i would like to explain so that people
who are just getting into the windows Kernel environment can gather some useful info.

• We get the content of the LSTAR MSR, which is a pointer within ntoskrnl.exe's memory.
• We iterate backwards at 64Kb granularity until we find a PE that looks like ntoskrnl's one.
• We get the PsLoadedModuleList ( which contains all the legitimately loaded drivers ) through ntoskrnl's exports.
• We iterate through the list and find the target module base address.
• We dynamically find the exports using some PE Header knowledge ( similar to MmGetSystemRoutineAddress )
• We then use some modern C++ features to create a single function call which can handle everything

And well... that's all, it's actually nothing new or extraordinary but it can still be useful for someone

For a simple code example ready to compile you can check out the example project.
It requires: ISO C++17 Standard (/std:c++17)

Initialization:

/* This will target ONLY ntoskrnl.exe */ 
NoImportz winapi;
/* In case you want to specify a specific module */
NoImportz fltmgr( L"fltmgr.sys" );
/* Initialization check */
if ( !winapi.is_initialized() )
 return STATUS_UNSUCCESSFUL;

Calling a function:

/* standard call */
PVOID addr = winapi.call<decltype( ExAllocatePool2 )> (
	"ExAllocatePool2", POOL_FLAG_NON_PAGED,
	4096, 'TeSt'
);
/* using wrapper MACROs */
addr = ni_call(
	winapi, ExAllocatePool2, 
	POOL_FLAG_NON_PAGED, 4096, 'TeSt'
);

• Supports all modules
• Supports variadic functions
• NEW: Supports caching