The FBI has issued an alert about Reveton, drive-by ransomware that first appeared in early 2012.

The term “drive-by” is typically applied to malware that affects users when they visit an infected web site. To put it another way: your computer can become infected by this malware if you visit an infected web site, even if you don’t click anything on that web site or view anything other than the home page. This is why even web searches have become somewhat dangerous.

“Ransomware” refers to malware that presents a warning to the user, in some cases pretending to be from a government agency, that they have violated some law or regulation. The solution presented is to pay a ‘fine’; any money paid goes to the malware’s perpetrator. Surprisingly, this fools enough people to make it a worthwhile scam.

PCWorld has additional information.