If you've recently received an email with an attachment that contains a seemingly harmless .exe file and tells you that the attached file is a Mario game, Beware! The attached file is actually a Mario side scrolling game with a Romario-A worm running in the background! Always exercise caution when opening attachments, especially .exe formats!
According to Ben Camm-Jones of www.webuser.co.uk:
Once it has infected your PC, the worm then attempts to mail itself to contacts in the recipient's address book as well as spreading on USB drives and other removeable media.And Graham Cluley, senior technology consultant at Sophos:
Fraudsters are constantly innovating to find new ways of tapping into users' psyches to tempt them into clicking on infected links and attachments, This kind of attack is particularly stealth-like because nostalgic gamers can actually play the game once they click, giving them no reason to suspect that something more sinister is lurking beneath