We have come across a new worm in the lab, "Foamer". For an unknown reason it hates DOS command line screens, so it modifies the Windows Registry to prevent users from using it. If you get infected and try to open one, it displays the message "THE WORLD-WIDE DONT ACCEPT COMMAND PROMPT!!!!"  but it occurs so fast that the user may not able to see it.

Here is a screenshot of what it is being displayed.


As usual, you can find more information about it here. To learn about other viruses check the encyclopedia.

IMHO, DOS prompts are not so bad…