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The worm infects computer servers that run on Microsoft Windows 2000 SQL software. Once it attaches to a server it transmits multiple data requests in a random manner to other addresses on the Internet looking for more vulnerable servers to infect. The effect is a flood of traffic that bogs down ISP networks and can even knock Web sites off-line, Hypponen said. He added the worm was probably installed on a faulty server by a virus writer or hacker within the past few days.