Threat Descriptons



Category :


Type :


Aliases :



A text file describing a new virus called PROTO-T was distributed via electronic bulletin boards and the Internet late in the year 1992. This text told about a virus of a new kind that was threateningly spreading itself all over the world. The virus was, among other things, claimed to be impossible to spot and supposedly able to hide itself in the RAM memory of a modem or a hard disk. This text and the things described in it are pure invention, it would be technically impossible to build a virus to match the description.


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

A virus cannot hide its code in the buffers of modems or hard disks, because these memory areas are very small and unprotected - in reality the virus code would be overwritten almost immediately. In any case, part of the viral code would have to be stored in normal DOS memory in order for a virus to function. PC computers execute code that is located in their core memory, and that code only.

It is possible to hide part of the viral code in the memory of a VGA card. Some viruses (like Starship and GoldBug) do so, but even in this case the virus can be found by normal means.

The text was apparently a practical joke that spread uncommonly far. On the other hand, this joke inspired the development of several new viruses. As rumors of PROTO-T spread, some individuals decided to take advantage of its reputation and wrote viruses that contained the text "PROTO-T". Naturally enough, these viruses contained none of the characteristics mentioned in the original description.

The 'real' Proto-T viruses are not known to be in the wild. Their characteristics differ a lot from each other.

More Support


Ask questions in our Community .

User Guides

Check the user guide for instructions.

Contact Support

Chat with or call an expert.

Submit a Sample

Submit a file or URL for analysis.