That's exactly what happened to me. Thank you for your detailed post. I couldn't bother to go into such great details since I'm quite gutted that I lost my 10 mil. Hope you get to the bottom of this. I have great suspicion on that official wallet download.
All my 74 million mooncoins got stolen. Obviously there are some malicious commands in the IRC network command and control.
http://moonchain.info/tx/97a301bac24644bd73c5a191f8068c473d7d266480482efb73b78025db7a8b0f#i179Good job Mooncoin developer, I am professional reverse engineer and former Professional Anti-Malware analyst and I can be quite sure that I have no malware on my PC.
So it has to be either:
1. Exploit in the way mooncoin handles transactions via the IRC (Haven't digged deep enough on the internals yet, using IDA (asm x86) not reading stupid source code)
2. Bad Wallet, which I checked it's identical to the one on the website.
3. My PC is infected, which I doubt since I just reinstalled it and all anti-virus programs are running.
I will report this to my colleagues in the anti-malware corporations (Yes the big ones) and we will do full analysis of the "wallet" and IRC networks.