A fake proof of concept for the MS12-020 RDP vulnerability has been doing the rounds. Called rdpsmash the python script contains a block of shellcode that actually executes “rm -rf /” on *NIX or recursively deletes system32 on Windows (the former is obviously far worse).
As Michael Thumann from Insinuator said in his article, “never run any untrusted code (especially exploits) without a detailed analysis.” Well said Michael.