Threat Description

Aleja

Details

Category: Malware
Type: Virus
Platform: W97M
Aliases: Aleja, Aleja.A

Summary


W97M/Aleja is a Word macro virus.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


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.


Variant:Aleja.B

W97M/Aleja.B is otherwise identical with W97M/Aleja.A, but this variant does not infect when a document is closed.





Description Details: Analysis: Sami Rautiainen, F-Secure


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