Th'Inquisitor was one of several readers to point out coverage of Apple's stealth security fix, included along with the recent Snow Leopard 10.6.4 update. Graham Cluley of Sophos first noticed the update to protect Mac computers from a Trojan, and the fact that Apple didn't mention it in the release notes. The malware opens a back door to a Mac that can allow attackers to gain control of the machine and snoop about on it or turn it into a zombie. "You have to wonder," writes Cluley, "whether their keeping quiet about an anti-malware security update like this was for marketing reasons." While he certainly has a point that Apple benefits by its users' belief that the platform is secure, you also have to wonder whether any such publicity from a security company has a marketing subtext, as well.