Summary
This virus was found in the end of 1993 in France, and later that year it was in the wild in Denmark. During 1994 reports of this virus has been received from almost all countries in Europe.
Removal
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
Jumper infects diskette boot sectors and hard disk MBRs in the usual manner. It infects hard disks only if the user tries to boot from an infected diskette. If the hard disk is infected the virus infects diskettes that are used in the computer. Not all diskettes will be infected, though.
Unlike most other boot sector viruses, Jumper doesn't hook the disk interrupt (INT 13h) at all; instead, it hooks INT 21h and INT 1Ch. Due this, Jumper is able to spread also under OS/2 or Windows 95, unlike most other boot viruses.
The virus will sometimes hang the machine when it's booted from a hard drive and will display graphical characters on the screen.
There exists also a slightly modified B variant. The virus has several alias names.
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