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  4. Yamanner.A

Yamanner.A

Alias:JS.Yamanner@MM, JS/Yamanner@MM, Email-Worm.JS.Yamanner.a
Type:Worm
Category:Virus
Platform:JS
Date of Discovery:June 12, 2006

Summary

Yamanner is a JavaScript worm that targets Yahoo! web-based e-mail and groups.

Additional Details

The Yamanner worm activates by just opening an infected e-mail message with Internet Explorer. To do this it uses a 0-day vulnerability in the Yahoo! Mail system. Yamanner builds its e-mail messages and sends them to the infected user's contacts. The sent e-mails look as follows:
  • Subject: New Graphic Site
    Body: Note: forwarded message attached.
The worm resides inside the e-mail body. It also tries to open a web page in another browser window.

Detection

F-Secure Anti-Virus detects this malware with the following updates:

[FSAV_Database_Version]
Version = 2006-06-13_02