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Welchia.(Security News)(Brief Article)

Welchia seeks out computers infected by Lovesan (Blaster), disinfects them and installs the Windows patch. Welchia belongs to the family of helpful viruses that actually benefit users. Members of this family penetrate computers, but do not cause any damage.

Such worms delete other malware and implement protective measures. The most famous worm from this family appeared in September 2001: CodeBlue searched the Internet for machines infected by CodeRed and disinfecteded them.

Welchia breaches computers using the same DCOM RPC vulnerability that Lovesan used. However, Welchia also uses the WebDAV (http://www.microsoft.com/technet/security/bulletin/MS03-007.asp) ...

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