Threat Description

Yamanner.A

Details

Category: Malware
Type: Worm
Platform: JS
Date Discovered: June 12, 2006
Aliases: Yamanner.A, JS/Yamanner@MM, Email-Worm.JS.Yamanner.a

Summary


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



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical 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:

Detection Type: PC
Database: 2006-06-13_02




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