A new variant of the Critroni, or CTB Locker, ransomware is being distributed that now offers the ability to decrypt 5 files as proof that paying the ransom will get you your files back. This variant also changed the extension of encrypted files from .CTBL to .CTB2. Unfortunately, there is still no known method of decrypting your files without paying the ransom.
more here...............http://www.bleepingcomputer.com/forums/t/546045/new-critroni-variant-offers-free-test-decryption-and-now-uses-ctb2-extension/
more here...............http://www.bleepingcomputer.com/forums/t/546045/new-critroni-variant-offers-free-test-decryption-and-now-uses-ctb2-extension/