Malware at Black Hat?
Well, I'm not of the profession, but I think if I was a malware creator I would definitely configure my tools to lay low and stay silent at and around events like Black Hat. After all its the place they're most likely to get discovered, analyzed and dissected, and you'd certainly prefer your precious tools remain under the radar and thus operational for as long as possible, isn't it?
Sounds to me like trying to pick pockets during a police charity.