Threat description


Category: Malware
Type: Virus
Platform: W32
Aliases: Bye


Bye is a typical boot sector virus which infects the boot sectors of diskettes and the main boot records of hard disks. The virus is capable of infecting all common diskette types (360, 720, 1200 and 1440 kilobytes). Bye was discovered in Italy, at the end of September 1994.

The virus infects the hard disk when the computer is booted from an infected diskette. Once the hard disk is infected and the virus has loaded itself into memory, it shall infect all non-write protected diskettes used in the computer.

The virus contains the following encrypted text: "Bye by C&CL".

Bye uses stealth virus techniques, so its code cannot be seen on the hard disk's MBR while it is resident in memory.

The virus stores the original main boot record on the last sector of the hard disk's active partition. On diskettes, the virus stores the boot sector on the diskette's last sector.

The virus changes only 40 bytes in the boot sector - the rest of the viruse's code is stored elsewhere. Bye does this to avoid being detected by heuristic scanners.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


More information on scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Description Details: Mikko Hypponen, F-Secure


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