It's a dangerous memory encrypted resident boot virus. It hooks INT 16h, 13h and writes 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
Depending on its internal counters the virus changes the keys that are entered from keyboard. It contains the internal text string also:
This Virus is from MEXICO, I have 15 years old
