Dr. Web estimates that about 600,000 Macs, most of which reside in the US (55 percent) and Canada (19.8 percent), are now infected members of the Flashback botnet. Apple’s support pages states that the company is developing a tool that will remove the Flashback trojan from existing machines. While the company doesn’t provide any release date for the software, it seems Apple has already begun requesting that ISPs shut down suspicious domains.
Apple Developing Flashback Removal Tool, Working To Shut Down Bot Network