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This is more a worm, not a virus.
It is a windows based, and is used like most of the viruses -in email
It can even leave an open door to hackers, so that makes it a litle like a trojan.
Very dangerous. It comes in email attachments with extensions like .exe, .scr and .pif.
You can recognise it by this subjects:

Hello!
update
Payment notices
Just a reminder
Correction of errors
history screen
Announcement
various
Introduction
Interesting...
I need help about script!!!
Please Help...
Report
Membership Confirmation
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My eBay ads
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The patch can be found on Microsoft Security Bulletin MS01-027.

Hmm, now you know why Linux is such a good OS=)