Worm? A computer virus!!!!!!

Worm was distributed by via the internet and had been written by student at Cornell University, Robert Tappan Morris and launched on November 2, 1988. A computer worm differs from a computer virus because it spread by itself. Actually, a virus needs a host program to run and virus code runs as a part of the host program. However computer worn can spread without a host program. The example of computer worm is Melissa worm of 1999. This worm shared some features of a Trojan horse, which are they spread enticing a user to open an infected e-mail attachment. So the best medicine to cure this virus is not opening attachments in your email. These attachments are not limited to EXE files. Microsoft Word and Excel files can contain macros which infection.