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Tere is a typical files virus. It stays resident and infects COM files when they are executed, renamed, deleted or their attributes are changed.


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

When files are executed from floppy drives, Tere first checks if the floppy is write protected by attempting to read and write back the boot sector of the floppy. The virus does not infect COM files longer than 64909.

The virus contains this text:

Tere Maailm!

This is Estonian and mean "Hello World!"

Tere was found in the wild in Estonia in February 1997.