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Unlike most other boot sector infectors, the DA'BOYS virus overwrites the DOS boot sector. It does not make a copy or move the boot sector to another sector. It will infect disks in drive A: or B: It works with 360kB, 720kB, 1.2MB, 1.44MB or 2.88MB disks.

When a disk is booted with the DA'BOYS virus, it will load itself into lower DOS memory. CHKDSK will not show a decrease in available memory. Then the virus will infect the DOS boot sector of the hard disk and overwrites the "Non-System ... " text string with it's own code.

The text string "DA'BOYS" appears in the virus code but is not displayed. If the Goldbug virus is also present in the system, it hides the presence of the DA'BOYS virus from the Windows 3.1 startup routine.


DA'BOYS can be removed from diskettes and hard disks with the DOS SYS command.

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.

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