Int10 is an unusual boot sector virus. It infects MBRs on hard drives and floppy boot sectors.


Automatic action

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.

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Technical Details

When an infected machine is booted from the hard drive, Int10 removes itself temporarily from the MBR and INT 13h chain in order to hide it's presence. When DOS has been loaded, it reinfects the MBR.

Int10 does not appear to be deliberately malicious. It activates at midnights during December or six hours after the machine has been booted (again, only in December). At this time it displays a graphic snowfall on-screen and halts the machine.

Int10 is encrypted with a simple key.

There are three known variants of this virus.

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