In the network the sorts of computer virus are various and we can not catch the speed of its renewing.After comparing many kinds of virus, in order to be close to reality, I choose the "Worm."

Iran admitted recently that a computer worm (presumably the mysterious Stuxnet) had disabled some of its centrifuges for a while.

Before everyone panics, let's get one thing clear: the new Twitter worm is only a proof-of-concept devised by computer security researchers at Secure Science - it is not out in the wild.