When speaking of malware, Windows is usually the poster boy for an OS that gets infected a lot almost by nature. In truth, however, no operating system is totally bulletproof. Even Apple's OS X and iOS, usually considered to be tightly guarded silos, have their fair share of intrusions. This latest incident is one such example but this time the affected platform is Apple's much larger Mac OS X. Named by security firm Palo Alto Networks as KeRanger, the ransomware's damage is worsened by the fact that it infected even legitimate installers of the Transmission BitTorrent client.