This virus is written in Pascal and was originally published in the book by Ralf Burger, just like Vienna. Several different forms exist, probably just compiled by different compilers.
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.
The source contains the following text:
Number One This is a very primitive computer virus. HANDLE WITH CARE! --- Demonstration ONLY!Number One infects all .COM - files in theCURRENT directory.A warning message and the infected file's name willbe displayed.That file has been overwritten with Number One'sprogram code and is not reconstructible!If all files are infected or no .COM - files found,Number One gives you a [Smile].Files may be protected against infections ofNumber Oneby setting the READ ONLY attribute. Writeen 10.3.1987 by M.Vallen (Turbo-Pascal 3.01A)
Since Number_1 has been written with Pascal and C, false alarms on files compiled with the same compiler are occasionally possible.