Cryptolocker (http://en.wikipedia.org/wiki/CryptoLocker) is a new malware that surfaced recently. It is wreaking havoc on Windows file shares and locking people out of their files. The malware encrypts commonly used documents and prevents the user from accessing them. The malware will then attempt to extract payment from you to unlock your files. Arstechnica has a great writeup on this (http://arstechnica.com/security/2013/10/youre-infected-if-you-want-to-see-your-data-again-pay-us-300-in-bitcoins/).
Some tips on dealing with this malware:
Thankfully, Symantec Endpoint Protection protects from this virus: http://www.symantec.com/connect/forums/cryptolocker-are-we-safe
Backup, backup, backup and don't open unkonwn emails..
thank you for article!
Thanks for raising awareness, megamanVI!
The article Recovering Ransomlocked Files Using Built-In Windows Tools, deals with a few possible ways how to prevent and recover from Trojan.Cryptolocker- one of today's most-destructive threats- should it infect your network and hold your data hostage.
I want to add that Spiceworks has some group policy templates that you can import and apply in your environment.
http://community.spiceworks.com/topic/396103-cryptolocker-prevention-kit-updated