Worm spread worldwide in 10 minutes

Thursday, 6 February 2003, 1:02 PM EST

The worm, which nearly cut off Web access in South Korea and shut down some U.S. bank teller machines, doubled the number of computers it infected every 8.5 seconds in the first minute of its appearance, said a computer security research group led by the Cooperative Association for Internet Data Analysis.

By comparison, the Code Red worm -- which came 18 months earlier -- only doubled every 37 minutes.

"We were pretty surprised by how quickly it spread," said David Moore, a senior technical manager at CAIDA. "This is the fastest we've ever seen something spread like this."

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