Suspending a riot process..how?

[Shub-Nigurrath]

Hi,
I investigated a little

the program launches itself and then closes it passing a parameter to another program that then launches the original program again.

Waiting for the main window's program I can corectly detect the correct processID, open it and then access to a valid handle, but the problem is that is won't still suspend itself. even if there's only one thread in the process and the processid is correct.

I have a doubt that zwSuspendProcess how I implemented it might not be working correctly (I read it directly from ntdll). But I cannot find an API which allow to pass from hProcess to an hTread and then being able to use SuspendThread.
Any suggestion?