You all should raise your guard! CryptoWall 4.0 has been released and analysed by Nathan Scott: http://www.bleepingcomputer.com/news/security/cryptowall-4-0-released-with-new-features-such-as-encrypted-file-names/

This is why I'm a super advocate regarding (offsite) backups! 3-2-1: 3 total copies of your data, 2 local but on different devices and at least 1 copy offsite!