Cybercrooks offer irate victims a free trial version of the tool that will allow them to salvage three precious files. Trojan.Crypt.VB.U encrypts or locks files on the host computer and tells users to buy $69 full version. Trojan encrypts files using the simple XOR algorithm, adds a header, and in the end it reverses the files. Trojan is constantly improved, with new variants. Newer versions are more efficient than the older ones as they only select and lock a few vital files from an application folder.”]