A newly discovered zombie network that exclusively targets Apple computers running Mac OS X across the globe has compromised roughly 17,000 machines so far. Researchers say almost a quarter of iWorm botnet are located in the US. The botnet uses a special method of spreading via a search service of Reddit posts to a Minecraft server list subreddit to collect the IP addresses for its command and control (CnC) network. The malware creates a backdoor on machines running OS X, which can be used to receive instructions in order to perform a variety of tasks.
Source: https://thehackernews.com/2014/10/over-17000-mac-machines-affected-by_6.html