Cybercriminals have spammed out a malicious attack, posing as a notification from the FBI that you have been visiting illegal websites.
A typical message reads as follows:
Subject: You visit illegal websites
Attached file: Document.zip
Sir/Madam, we have logged your IP-address on more than 40 illegal Websites. Important: Please answer our questions! The list of questions are attached.
If you make the mistake of running the program in the attached ZIP file, you'll find that your computer is hit with a fake anti-virus attack - designed to scare you into handing over your credit card details.
Of course, if you have your wits about you you would realise that the email looks very suspicious in the first place. But there's always the danger that some folks will be so worried that the FBI believes they might have been visiting naughty websites, that they'll click on unsolicited email attachments without thinking.