Several Web sites have sprung up over the last couple days offering users free upgrades of Apple's latest operating system, Mac OS X 10.6 Snow Leopard. Of course, these sites are socially engineered ploys to trick users into downloading malicious software. Much like the iWork '09 and Adobe CS4 infected install packages we reported on in the spring, these Snow Leopard download sites are enticing users to get a free copy of the popular software, only to add a malicious version of a DNS Changer Trojan to their Mac.
