Hantaner is a prepending virus. There exist packed and non-packed variants of Hantaner. The virus infects files in Kazaa P2P (peer-to-peer) client shared folder.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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Hantaner writes itself in front of executable files in that folder (prepending infection). When someone downloads and runs a file from an infected computer, he/she also becomes infected with the virus.