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Impact of W32/Welchin Virus

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dholbrook

IS-IT--Management
Jan 23, 2003
295
US
Had an interesting side result of an infection of a computer with the W32/Welchin virus (the one that tries to fix the Balster virus).

Had a user that had no/expired virus protection on his laptop bring his infected system behind the firewall and connect to the network. The infection was spread to another system that had been overlooked during the critical updates. This was a small laptop running Win2000 Pro being used as a print server for an HP printer. OThis system was infected and almost crashed my firewall ad network by sending thousands of incomplete requests toward the firewall. Consider it a reverse DOS attack! The printer's laptop system had no Outlook users on it, only a bare bones Win2000 install, but was still be infected by the virus via its network access, not by any mail.

Just a warning and heads up to all, MAKE SURE you bring ALL systems behind the firewall up to date with all the critical updates, or face the fun of trying to locate a single system which impacts everyone. You need to protect against you own users too!

HTH

David
 
The Blaster worm negated perimeter only protection.

I'm Certifiable, not certified.
It just means my answers are from experience, not a book.
 
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