There is strong evidence that new PHP malware which attacks outdated or insecure websites does not simply abuse the site for illegal purposes but now encrypts all data contained on the site to hold ransom. Click here to access a news article (Softpedia).
It is of highest importance to keep both your computer and your website always up to date and to remove any old or deprecated software. Should your website despite all precautions become infected, we recommend NOT to pay the ransom but to request a backup restore from our secure backups via support ticket.