Threat Descriptons



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Swizzor is a small trojan-downloader that can end up on a user's system when they are browsing the Web. The trojan silently downloads and installs additional trojan downloaders and adware components.


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

This Trojan variant is a PE executable file that is packed with a custom-made file compressor. Upon execution, this Malware tries to download a file from the following website:


The Trojan uses the "KRSystem v1.0" as an user-agent ID and it accesses the website with a specially constructed URL. The downloaded files will be stored in the directory for temporary files:

  • \%Temp%\%random%.exe

%random% stands for a randomly generated name. If the download operation is successful, the Trojan runs the downloaded files afterwards. This particular Trojan variant downloads another downloader that in turn downloads the second level downloader. That file can download additional components and adware to the infected computer. The downloaded adware is related.

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