C Keylogger or process attachment

[eggscrambler]

I just need help on how to either attach my program to another process or how to make a UI that is not seen and allows people to type in other windows while mine logs the keys. Any help would be appriciated. I understand how to log the keys but not in a way that the user would not notice.

[ghost107]

For attaching to another process you should read on this windows API:
OpenProcess()
VirtualAlloc()
ReadProcessMemory, WriteProcessMemory(This functions are detectable by the AV, so instead use VirtualProtect + memcpy, memset)
CloseHandle()

Now for For Injecting a DLL:
LoadLibrary()
GetProcAddress()
FreeLibrary()

To make a program that it is not seen you should learn to hook NtQuerySystemInformation, to remove your program from process list.

If hooking NtQuerySystemInformation is too hard you could always just make your application invisible or don't create a window,this way you will only be visible into the system processes.

To read keyboard keys there are some windows API like GetAsyncKeyState().

[henson]

A little hard for me to understand,
If you want to attach the keylogger to other program, don't forget to disable your AVG. Or you can consider to directly install an invisiable keylogger.