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A new type of malware infects PCs using file-share sites and publishes the user's net history on a public website before demanding a fee for its removal.
The Japanese trojan virus installs itself on computers using a popular file-share service called Winni, used by up to 200m people.
Masquerading as a game installation screen, it requests the PC owner's personal details.
It then takes screengrabs of the user's web history and publishes it online in their name, before sending an e-mail or pop-up screen demanding a credit card payment of 1500 yen (£10) to "settle your violation of copyright law" and remove the webpage.