Tools
A useful tool to help prevent infection from cryptolocker viruses:
https://www.foolishit.com/cryptoprevent-malware-prevention/
It’s Free, simple and easy to use / deploy.
Cryptolocker De-crypter
This tool has been known to work. For this to work you need to have 1 file that has not been encrypted and it’s encrypted version. You could use a default OS file such as Windows Sample pictures or the IIS default image. The tool compares the two to work out the decryption key.
http://www.bleepingcomputer.com/virus-removal/cryptxxx-ransomware-help-information#decrypt
This tool is also Free!