If there's a new computer "worm" on the Internet and no one knows about it, can it still be stopped before widespread damage is done? Maybe.

Past online outbreaks, such as Sasser, Nimda and Mydoom, have shown that malicious programmers are getting better at creating their malicious software, or malware. Security experts say online infections are occurring at alarming faster rates, infecting millions of computers in matters of minutes, not days as in previous outbreaks.

By Paul Eng at ABC News.

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