Based on that same research, Kaspersky concluded that approximately 1% of the 600,000 machines in the botnet were running FreeBSD or Linux, and 0.06% were running Windows 7 or Windows 8.
Lost in the news of the largest Mac malware outbreak in history is the fact that 2 other *nix OSes widely regarded as paragons of security – Linux and especially FreeBSD – are affected also. I haven’t seen any details of which Linux distros are vulnerable or whether the bug has been patched on either OS, so I have no idea whether these infections are due to user negligence or client insecurity.
Also of note is the fact that the infection rate for those OSes is about 17 times higher than it is for Windows. The main takeaway here might be that the emergence of Android and iOS (both *nix based) as the world’s leading mobile OSes combined with strong Mac sales and Apple’s documented lackadaisical approach to security may have suddenly made *nix OSes preferred malware targets.