Virus.Boot.15years is a dangerous memory resident boot sector encrypted virus on DOS.

There are 2 variants:

  • Virus.Boot.15years.b
  • Virus.Boot.15years.c


When the virus is loaded, it hooks INT 16h and 13h to write itself into MBR of hard drive and boot sectors of floppy disks.


On April, 7th it overwrites disk sectors with the string:

Esto te pasa por programas que a nosotros nos cuesta tanto
trabajo hacer. Que te quede de Experiencia, México,1994.

Translation (from Spanish):

This is what you get from programs that cost us so much
work to make. We hope you keep this Experience, Mexico, 1994.

This may be referring to the Mexican peso crisis of 1994.

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