Last week, Russian Anti-Virus company Doctor Web, found that the Flashback Mac Trojan has infected almost 600,000 systems.
With many of those infected located in the US (see below chart from Dr. Web). The large infection rate has raised some eyebrows, especially since many believe that Macs can not get viruses.
The trojan uses a Java exploit to gain remote access, and possible keylogging capabilities. The malware programmers are targeting three separate Java vulnerabilities in the attack.
(click image for more information and to enlarge)
Apple has since patched the vulnerability and according to an Apple security bulletin, the OS X Lion 2012-002 and Java for Mac OS X 10.6 Update 7 can be downloaded and installed via Software Update preferences, or from Apple Downloads.
Doctor Web has created an online tool to check to see if your machine is infected, and security software company F-Secure has released instructions on how to remove the virus if you are indeed infected.