Threat Descriptons



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Aliases :

Busan, Worm.Win32.Busan


This worm spreads by copying itself to all accessible network resources. The worm is Windows application (C++ PE EXE-file). It's packed by UPX and is around 14kB large.When executed, the worm sends a message through ICQ to the author of the worm, then copies itself to Windows directory with name "files32.sys", and also copies a file "mh32.dll" there. This is a keyboard hooker. Then the worm tries to copy itself with name "auto.exe" to following directory:

C:\WINDOWS\All Users\Start Menu\Program Files\StartUp\

Because of a bug, this fails. Next the worm copies itself to all accessible network shares.After that the worm registers itself in the system register in a key:

@="files32.sys \"%1\" %*"

This means that when executing any EXE-file the worm will be started.The worm collects information from the local system and tries to send them to the worm writer. This includes addresses, passwords and results of the keyboard snooper.The worm tries download a file "worm31.bmp" from a web-site in the Internet, but this page has been removed and the download fails.[Kaspersky Lab, 13th of April 2003]


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.

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