If you've removed Java from Lion or simply don't have it installed, this free Flashback Malware Removal Tool from Apple makes sure that the Flashback Trojan hasn't infected your Mac.
The tool removes the most common variants of the Flashback malware and contains the same malware removal tool as found in Apple's Java for Lion Update 2012-003. If the Flashback malware is found, a dialog will be presented notifying the user that malware was removed. Apple warn that in some cases, the Flashback malware removal tool may need to restart your computer in order to completely remove the Flashback malware. This tool is highly recommended for all OS X Lion users without Java installed.
Apple Flashback Malware Removal Tool is highly recommended for all those that have either removed Java from Lion or don't have it installed.