W32/Mytob-EW and W32/Sdbot-BN are two kinds of dangerous worms that contain a virus which duplicates itself many times in a network. They are programmed by cyber criminals for DDOS attacks and to steal private information. Once loaded, W32/Mytob-EW and W32/Sdbot-BN will corrupt your system files so that it can run automatically whenever you log in the system. Then you will find plenty of strange files on the system for W32/Mytob-EW and W32/Sdbot-BN can reproduce itself at a high speed and spread to all of your drives. At the same time, it changes its name and adding new characteristics from time to time to gain difficult to be found and removed.