Welcome to the Virus Encyclopedia of Panda Security.
Mapson is a worm that does not have any destructive effects, which spreads via e-mail. After affecting a computer, it sends copies of itself to all the e-mail addresses in the Contact List of the instant messaging program MSN Messenger.
The e-mail message carrying Mapson has extremely variable characteristics. However, the subject and message are always in Spanish and the attached file almost always has a PIF extension.
As well as e-mail, Mapson also spreads through P2P (peer-to-peer) file sharing programs.
Mapson displays messages on screen and creates a large number of copies of itself on the computer.
Mapson is easy to recognize, as when it is run this worm displays the following message in Spanish on screen:
Similarly, in July this worm displays two windows with the following characteristics:
Finally on the fourth of each month, Mapson opens the Internet browser and displays a web page containing information about the worm author.