This latest virus is maddening. I really hope the people who started this and operate it are punished severely. The details provided by The University of Regina (I think it applies only for PCs, but I'm not sure about that):
There are more details at Snopes.
There is currently a 'Crypotolocker' ransomware virus circulating that permanently encrypts all the files on your computer then demands a fee for the key to access the files. It also encrypts any documents that you have write access to on connected network and Novell drives. The virus is sent as an attached file on an email, and once you open the attachment it runs immediately. At the moment the only way to get the files back is either use a file restore if there was a backup or pay the fee.
As always, please be very cautious when opening attached files in your email. For this particular virus, the subject of the email is often something simple and seemingly benign like "Subject: Scanned Image from a Xerox WorkCentre". An example of the email we have seen on campus is at the bottom of this message, with Subject: "Last Month Remit" with an attached .xls Excel spreadsheet.
Some virus scanners are not able to detect this virus, so be sure to update your virus scanning software regularly to ensure that your system is protected as new updates become available.
This is outright extortion, and it is terribly inefficient. Authorities should be able to trace the money and put these schmoes out of business. A nicely operated drone might do the trick.