Hi aprasanna,
This is indeed the malicious campaign which Symantec has been warning about.
New article: CTB-Locker and other forms of Crypto malware
https://www-secure.symantec.com/connect/forums/new-article-ctb-locker-and-other-forms-crypto-malware
Please see if you can identify the incoming mail, typically pretending to have a fax attachment, which caused the infection. If this is not already detected, please do submit it to Security Response! This will not help to decrypt any documents already sabotaged (those need to be restored from a known good backup) but it will help to spare others from falling victim to the same threat.
These articles may help as well:
Recovering Ransomlocked Files Using Built-In Windows Tools
https://www-secure.symantec.com/connect/articles/recovering-ransomlocked-files-using-built-windows-tools
Ransomcrypt: A Thriving Menace (aka Cryptolocker: A Thriving Menace)
https://www-secure.symantec.com/connect/blogs/ransomcrypt-thriving-menace
Cryptolocker Q&A: Menace of the Year
https://www-secure.symantec.com/connect/blogs/cryptolocker-qa-menace-year
First Response to: Cryptolocker \ Ransomcrypt\ Encryptor
https://www-secure.symantec.com/connect/articles/first-response-cryptolocker-ransomcrypt-encryptor
Also:
The Day After: Necessary Steps after a Virus Outbreak
https://www-secure.symantec.com/connect/articles/day-after-necessary-steps-after-virus-outbreak
And:
A good Connect forum thread on how to protect yourself: https://www-secure.symantec.com/connect/forums/cryptolockercryptodefense-defenses
With thanks and best regards,
Mick