Yamanner.A

Classification

Category :

Malware

Type :

Worm

Aliases :

Yamanner.A, JS/Yamanner@MM, Email-Worm.JS.Yamanner.a

Summary

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

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

The Yamanner worm activates by just opening an infected email message with Internet Explorer. To do this it uses a 0-day vulnerability in the Yahoo! Mail system.

Yamanner builds its email messages and sends them to the infected user's contacts. The sent emails look as follows:

  • Subject: New Graphic Site Body: Note: forwarded message attached.

The worm resides inside the email body. It also tries to open a web page in another browser window.