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Category: Malware

Type: Email-Worm

Aliases: Mytob.em


This Mytob variant was found at the beginning of May 2006. It sends email messages with a URL to the worm's file that is located on a possibly hacked computer.


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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About the product

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Computers infected by the worm send email messages with a URL that points to the worm's file. The worm fakes (obfuscates) the download URL and inserts the user's domain name and email address to the message body to make the message look trustworthy. Here's a sample of a message:

Dear Valued Member,
According to our terms of services, you will have to confirm your email by the following link,
or your account will be suspended within 24 hours for security reasons.

After following the instructions in the sheet, your account will not be interrupted and will continue as normal.

Thanks for your attention to this request. We apologize for any inconvenience.

Sincerely, *Domain* Abuse Department

where *domain* is the domain name of the recipient and *email_address* is the recipient's email address. The URL points to the file named Confirmation_Sheet.pif that is located on a possibly hacked computer. When a user downloads and runs an infected file, his computer becomes infected and the worm starts to spread from it.