c++ Inject dll to cmd.exe monitoring commands

Question

I try to inject a dll to cmd.exe which will hook the input commands and save them to file. i managed to do the injection and get some of the info i want using hook on WH_KEYBOARD.

how can i hook the input of cmd.exe process by other way rather then hook keyboard event?

Answer 1

You can look through the WinAPI calls cmd.exe makes and find one that takes the command string as argument and hook it, eg with Microsoft Detours . You could also hook cmd.exe 's internal functions but this is less portable.

I loaded the cmd.exe I have on my Windows system (Windows 10 v1511 x86_64) into x64dbg and there are two calls to ReadConsoleW . The first one:

Address=00007FF6331A29CC
Disassembly=call qword ptr ds:[<&ReadConsoleW>]
Destination=cmd.&ReadConsoleW

is called after processing every command entered via the console.

Per x64 fastcall convention , its second argument (The buffer) is pointed to by rdx . While it's formally an output parameter, prior to calling the function it points to a CRLF terminated copy of the entered command.

You can either hook that call or trace back from there and find a more suitable place to hook.