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 move the file to the quarantine where it cannot spread or cause harm, or remove it.
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.
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