12/1/2003
The new worm, dubbed "Gruel" is a mass-mailing worm that masquerades as a Windows software patch from Microsoft and as a virus removal tool from Symantec.
Like other mass mailing worms, Gruel spreads by stealing e-mail addresses from an infected computer's Microsoft Outlook address book and mailing copies of itself to those addresses.

The worm deletes files from machines it infects and copies itself into various locations, including folders used by the Kazaa file-sharing network, enabling it to spread on that network as well. In other words, people who are susceptible are people that download music.
While the number of infections is still low, Gruel has a number of characteristics that have allowed other worms to successfully spread in recent months.
In addition to its clever use of so-called "social engineering" tricks such as using the names of Microsoft and Symantec to fool recipients, the coupling of mass mailing techniques and features to spread over peer-to-peer networks makes Gruel more dangerous.
Unlike other worms, however, Gruel does not spread over shared folders on local area networks.
While most organizations have antivirus software that will block or quarantine the executable attachment containing the Gruel virus, home users without such protections will likely bear the brunt of the new worm.

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