The document discusses the new version of ransomware called CryptoWall (also known as Cryptolocker 2.0). CryptoWall encrypts files on infected devices and demands ransom payment for the encryption key. It has been improved from the original Cryptolocker with unique payment IDs, increased encryption security, and use of independent servers to process payments. The document recommends not opening suspicious attachments or emails from unknown sources to prevent infection. Maintaining regular backups of important files is also suggested in case files are encrypted and ransom is not paid.