C++: Injecting 32 bit targets from 64 bit process

Question

I have written a DLL-Injector in C++ recently, for which the requirements were the following

• The INJECTING PROCESS (let\'s call it the \'Injec

Answer 1

This answer addresses an earlier version of the question, it is mostly irrelevant to the case of a 64-bit injector.

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Are you saying that approach works? Because according to the documentation, you can't get information about 64-bit processes from WOW64:

If the function is called by a 32-bit application running under WOW64, the dwFilterFlag option is ignored and the function provides the same results as the EnumProcessModules function.

(EnumProcessModules explains the restriction further)

If this function is called from a 32-bit application running on WOW64, it can only enumerate the modules of a 32-bit process. If the process is a 64-bit process, this function fails and the last error code is ERROR_PARTIAL_COPY (299).

But you really do need to find the base address where kernel32.dll loaded, because of ASLR.

Answer 2

I think you could use the debug symbols API to save yourself parsing the PE header and export table. This route should yield the required information for the 32-bit injector; 64-bit target case as well, although I still don't see how you're going to pass a 64-bit address to CreateRemoteThread.

• EnumerateLoadedModules64
• SymFromName
• ImageRvaToVa

Normally these debug symbol functions require a .pdb or .sym file to operate, however I'm pretty sure they also get information from a DLL export table (just going from experience of what a debugger shows for files where I don't have symbols present).

Answer 3

I stumbled upon this thread looking for a solution for the same problem.

So far I'm inclined to use another simpler solution. To obtain a 32-bit kernel proc address, the 64-bit process can just execute a 32-bit program that will look up the proc addresses for us:

#include <Windows.h>

int main(int argc, const char**)
{
    if(argc > 1)
        return (int) LoadLibraryA;
    else
        return (int) GetProcAddress;
}