The media has been full of the stories on how over half million Macs have been infected by the Flashback Trojan! The infection would have taken place when the user downloaded something through a Flash installer. So the question that must be on all Mac users’ lips has to be, is my computer affected by this? Well it is easy enough to find out with this tool, just download, unzip and run the two apps.
So you now know if your machine is clear or infected, in which case there is help available, from F Secure, or alternatively look out for the Apple update called Java for OS X 2012-002, this will also do the job for you without the need to go through the F Secure way.
According to the F Secure Trojan Downloader page, here is what the infection does;
Trojan-Downloader:OSX/Flashback.I connects to a remote site to download its payload; on successful infection, the malware modifies targeted web pages displayed in the web browser.
And here is a word of warning before you proceed;
Caution: Manual disinfection is a risky process; it is recommended only for advanced users. Otherwise, please seek professional technical assistance. F-Secure customers may also contact our Support.