In a new type of online attack, extortionists remotely encrypt user files and then demand money for the key to decode the information.
In a case documented by San Diego-based Web security company Websense, the attack occurs after a user visits a Web site containing code that exploits a known flaw in Microsoft's Internet Explorer Web browser. The flaw is used to download and run a malicious program that in turn downloads an application that encrypts files on the victim's PC and mapped network drives, according to Websense. The program then drops a ransom note.
Even though this type of attack is not widespread at this point, Internet users should be aware of the threat, said Oliver Friedrichs, a senior manager at Symantec Security Response. "It is certainly concerning. This is the first time that we have seen cryptography used in this type of attack to hold your information hostage," he said.
