Injecting 32bit dll into 64bit process - Autoit makes it possible?

Question

afaik there is no way to inject 32bit dlls into 64bit processes and vice versa (at least it's not possible with my c++ written injector / dll). However, when using the Autoit injector from http://pastebin.com/AGWw2kT8 it is possible to inject 32bit dlls into 64bit processes. This Autoit library uses the same way of injecting as my c++ injector (CreateRemoteThread). Can someone explain this behaviour?

Answer 1

CreateRemoteThread 32->64 won't work!

CreateRemoteThread 64->32 will work!

More info on that subject here

Answer 2

I've found the reason why the injection was successful. In the Autoit injection test script I use @SystemDir & "\\calc.exe" as path for the target application. However, on a 64bit Windows installation the @SystemDir macro points to C:\\Windows\\SysWOW64 instead of C:\\Windows\\System32 - therefore the script started the 32bit version of calc.exe, in which the injection succeeded.

Answer 3

It can't possibly work (you can't mix 32 and 64 bit code in one process). Therefore it doesn't. It may of course fail to make it clear that it hasn't worked.