This code is at the point where we SHOULD see a crash (given that the payloads in use for kernel/user are both just As and Bs (deliberate at this point). Unforunately the exploit does not result in a crash. Things just keep on going! I've looked at the difference in the traffic across the two different exploits (py and rb) and what's clear is that the mixin is doing a lot more work at the start. Also, the mixin generates packets of smaller size in the way that it encodes data (ie. it doesn't always use 2 bytes for a short value, it'll use 1 instead if only 1 is required). Pretty sure that the size issues aren't the problem, I think there's something else in play. I'm at the point where diving into the RDP stuff even more isn't inspiring so I'm hoping that opening this up to collab will help us move forward.
Metasploit

The Metasploit Framework is released under a BSD-style license. See COPYING for more details.
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Installing
Generally, you should use the free installer, which contains all of the dependencies and will get you up and running with a few clicks. See the Dev Environment Setup if you'd like to deal with dependencies on your own.
Using Metasploit
Metasploit can do all sorts of things. The first thing you'll want to do
is start msfconsole, but after that, you'll probably be best served by
reading Metasploit Unleashed, the great community
resources, or the wiki.
Contributing
See the Dev Environment Setup guide on GitHub, which will walk you through the whole process from installing all the dependencies, to cloning the repository, and finally to submitting a pull request. For slightly more information, see Contributing.