Summary

Espejo is a typical boot sector virus. It's partly encrypted and contains the following text:

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

which translates to something like this:

        This happened to you because you copied the programs we
        worked so hard at to create. Remember this experience,
        Mexico, 1994

Additional Details

The virus activates on April 7th. On that date it will overwrite part of the hard drive with the above message.

Virus also contains this encrypted text:

        This Virus is from MEXICO, I have 15 years old

[Analysis: Mikko Hypponen, F-Secure]