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
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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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