CryptoWall 3.0
It looks like Cryptowall developers have started distributing a new and more powerful version of their CryptoWall encrypting Ransomware. This new version called CryptoWalll 3.0 passes traffic to a site where users can pay for their decryption keys through anonymity networks.
For more details see the following links
http://blogs.technet.com/b/mmpc/archive/2015/01/13/crowti-update-cryptowall-3-0.aspx
https://isc.sans.edu/diary/Traffic+Patterns+For+CryptoWall+3.0/19203
http://sensorstechforum.com/remove-cryptowall-3-0-and-restore-the-encrypted-files/