Nimda (that's "admin" spelled backward) hit the virus scene in 2001 and quickly (very quickly) rose to the top.
In just 22 minutes, Nimda went from a nothing to being the most widespread computer virus on Earth. How?
It spread via email, via Web sites,
via server vulnerabilities. It pretty much had all the bases covered. It
even used some old backdoors opened up by past viruses to get into
servers and muck up Internet traffic.
As for the fear factor, Nimda had
great timing, hitting just a week or so after the Sept. 11 attacks and
prompting fear that it was the first in a new wave of Al Qaeda
cyberterror attacks.
Those fears turned out to be
unfounded and, while a few networks may have crashed, our Internet
infrastructure is still standing today.
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