Those fake FBI messages have a zip file attachment which contains the virus. Trust me, there is NO WAY any government agency has the resources or interest to just randomly track your internet activity.
And if for some reason you
had done something that made a law enforcement agency suspicious, they would never announce their findings via an e-mail message
FYI -
That same virus comes in other messages with some other 'official sounding' subjects such as:
- Your Password
- You visit illegal websites
- Registration Confirmation
- SMTP mail failed
and if you are not interested in those , it also comes in this flavor:
- Paris Hilton and Nicole Richie