W97M/Aleja is a Word macro virus.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the 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.
W97M/Aleja.A infects the global template when an infected document is opened. After that every document that is opened or closed will be infected. Additionally, if the user is running Spanish version of Word, then all documents saved via "Archivo/Guardar" or "Archivo/Guardar Como" will be infected.
At the first time when the virus is executed in the system, it creates a file ("Aleja5.ini") to the Windows directory. This file holds a counter that starts from 50, and it is decreased each time when a document is printed in Word. When the counter reaches zero, the virus activates its payload and replaces the contents of the header of the first section with the following text:
Documento infectado con el virus ALEJA5
The payload activates only in Spanish version of Word.
This virus also disables the built-in macro virus protection and removes the "Tools/Macros" menu.
W97M/Aleja.B is otherwise identical with W97M/Aleja.A, but this variant does not infect when a document is closed.