Devious virus writers have come up with a new twist on ransomware-style malware.A new strain of Trojan encrypts recently-opened files on compromised Windows PCs. But instead of demanding a ransom for a decryption key to unlock files, the malware relies on users to search the web for a possible way-out.
http://www.theregister.co.uk/2009/11/03/ransomware_ruse/