A simple system for hooking protected applications. I have employed this method to make hooks for various MMORPG games, for the past two years.
void __security_init_cookie(void); // dear friend!Most Windows binaries have a predictable pattern that can be used to our advantage.
To do this we take advantage of the fact that __security_init_cookie is called by the CRT when it's initialized.
The initialization is the first call at the OEP:
__int64 start()
{
__security_init_cookie(); // hello!
return __scrt_common_main_seh();
}
GetSystemTimeAsFileTime is the first import called first in __security_init_cookie
GetSystemTimeAsFileTime is embarassingly easily to recreate within our own code. We only need only a few structures. And I do not wish to share my ntdll.h =x
We recreate the original GetSystemTimeAsFileTime function, and perform our hooking inside, having added a check to determine when our target is decrypted in memory, and unhooking our hook as our last step, not to add lag to the game.
CLIENT_ID KSYSTEM_TIME KUSER_SHARED_DATA (however we only need the first 5 entries of this structure)
For further elaboration on this idea, I suggest you look over the project code, which I have made compatible with Windows 11 22H2, ...
In hopes someone finds purpose with it,
-Fyyre