Threat Description



Category: Malware
Type: Email-Worm, Net-Worm, Backdoor
Platform: W32
Aliases: Mytob.em


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


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

Computers infected by the worm send e-mail 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 e-mail 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 e-mail by the following link,  or your account will be suspended within 24 hours for security reasons.  http://www.*domain*.com/confirm.php?account=*e-mail_address*  

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 *e-mail_address* is the recipient's e-mail 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.


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

Detection Type: PC
Database: 2006-05-02_01


Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More