Backnote

Threat description

Details

Summary

This is not a virus but a Windows-based trojan horse.



Removal

Automatic action

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

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

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

Technical Details

There are two variants of the backdoor. They have been circulated in e-mail and newsgroups postings as attachment files called PICTURE.EXE and MANAGER.EXE, sized 353792 bytes and 348672 bytes. Both of them copy themselves to the Windows directory as a file called NOTE.EXE file name and register themselves to be executed every time Windows boots up.

After this, the trojan gathers information from the machine, including username and password, copies them to an encrypted DAT file and tries to e-mail that file to addresses abreb@hotmail.com and chinafax@263.net.

This trojan does not spread by itself. It can be removed simply by deleting the NOTE.EXE file and the original carrier file. It is recommended that you change your password if you believe to be affected by this trojan.

Backnote was widespread between Christmas and New Year 1998.

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