W32.HLLW.Yoof

W32.HLLW.Yoof is a worm that spreads by using the KaZaA file-sharing program. It tricks KaZaA users into downloading and executing the worm.

When W32.HLLW.Yoof runs, the worm copies itself as %system%\SystemConfig.exe and creates the %system%\Media shared folder. It then copies itself to this folder using numerous file names, some of which are:

• Email Bomber.exe
• FileServer.exe
• Kazaa Clone.exe
• Napster Clone.exe
• Winmx.exe
• Website Hacker.exe
• Hotmail Hacker.exe
• Windows Hacker.exe

Protection

• Initial Rapid Release version August 22, 2002
• Latest Rapid Release version July 19, 2008 revision 019
• Initial Daily Certified version August 22, 2002
• Latest Daily Certified version July 19, 2008 revision 018
• Initial Weekly Certified release date August 22, 2002

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Low

Distribution

• Distribution Level: Medium