The FBI Virus is also referred as Greendot virus, Citadel Reventon disguise itself as FBI, and if you want to access your computer in the allotted time of 48-72 hrs then you have to pay the penalty of $100, $200 or more using Moneypak Card.
FBI virus on Mac Locks the Safari Browser and gives you a warning, you cannot close safari to exit it.
2. From the drop-down menu click on Reset Safari.
3. Select all the checkbox and click on Reset.