Ransomware: Trojans Demand Money From Victims
About.com: Antivirus Software, By Mary Landesman
Having your computer infected with a virus or other malicious software is upsetting enough. But having your files literally held hostage is even worse. A ransomware trojan attack infects the system, encrypts the files, and then demands payment from its victims. One of the first to receive wide publicity was the May 2005 discovery of the PGPcoder Trojan.