W32.Sahay.A@mm

W32.Sahay.A@mm is a mass-mailing worm that sends email messages to all the addresses in the Microsoft Outlook Address Book. The email message has the following characteristics:
Subject: Fw: Sit back and be surprised..
Attachment: MathMagic.scr

The worm attempts to prepend itself to all the .exe files it finds in the Windows folder and C:\Program Files\Mirc\Download folder. Due to bugs in the worm's code, this threat may crash the computer or corrupt files in these folders. Then, the worm restarts the computer.

Protection

• Initial Rapid Release version January 15, 2003
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version January 15, 2003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date January 15, 2003

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: Moderate

Damage

• Damage Level: Low

Distribution

• Distribution Level: High