More than half a million Macs infected... While it may not be the Macpocalypse some have been warning about, but the Flashback Trojan thats spreading across the Macintosh universe is something users of Apples computers will want to pay attention to. This piece of malware has infected more than 600,000 Macs. Earlier Wednesday, a Russian antivirus company claimed the Flashback Trojan was running on more than 550,000 Macs, including 274 in Apples hometown of Cupertino, Calif. The Trojan doesnt attack OS X, but rather exploits a flaw in the Java platform that runs on Apples operating system. Oracle patched the hole some time ago, but Apple which distributes Java for OS X only got around to releasing a fixed version this week. If you have not run Software Update on your Mac this week, do it now. And if youre one of those folks who ignore update notifications on OS X and let them pile up, its time to change that behavior. And shame on Apple for not releasing this patch sooner. The fix has been out for a while, and Apples dragging its heels in distributing it likely contributed to the number of infections.