W32.Yaha.T@mm

W32.Yaha.T@mm:

• Is a worm that is a variant of W32.Yaha.J@mm.
• Terminates some antivirus and firewall processes.
• Uses its own SMTP engine to email itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, and in all the files whose extensions contain the letters HT.

The email message has a randomly chosen subject line, message, and attachment name. The attachment will have a .com, .exe, or .scr file extension.

This threat is written in the Microsoft C++ language and is compressed with FSG.

Protection

• Initial Rapid Release version June 25, 2003
• Latest Rapid Release version June 25, 2003
• Initial Daily Certified version June 25, 2003
• Latest Daily Certified version June 25, 2003
• Initial Weekly Certified release date June 25, 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: Medium

Distribution

• Distribution Level: High