No. The Zeus family of malware does not infect OSX, only Windows. Macs can of course be infected with malware, anyone who says otherwise is sorely mistaken. Some more info, GameoverZeus is simply an improved Zeus. It is run as a P2P (peer to peer) network, and operated by an HTTP control panel. The source code of Zeus can be found with a Google search so that's how that happened. It's one of, if not the most sophisticated bots on the market next to TDL. It's even able to bypass two factor authentication, along with all of the plugins you would see in bots like SpyEye, ICE9, Carberp, and Citadel.