'Flashback' trojan estimated to have infected 600K Macs worldwide

'Flashback' trojan estimated to have infected 600K Macs worldwide - A trojan horse named "Flashback" that surfaced last year is believed to have created a botnet including more than 600,000 infected Macs around the world, with more than half of them in the U.S. alone.

(Via AppleInsider.)