Hello,
I'm ready to start working on your project right now. Firstly, let me share my vision of the implementation and why I ask so low price.
1) RDP is Remode Desktop Protocol. As I understand you need an application, which will scan over the network and provide you addresses and ports of RDP enabled nodes.
2) RDP is TCP based protocol. So, first we may check the known port (3389) for TCP-connection. Then we need to check that behind the port is actual RDP service. I'm absolutely sure that RDP has known protocol bootstrapping procedure.
3) To enable multithreading I will use boost library [login to view URL]
4) I'm using CMake to build projects, so, you can build the brute forcer easily.
5) I'm going to provide you necessary documentation and fully commented source code.
Best,
Vyacheslav