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As previously reported by CNET News.com, the worm is spreading moderately quickly. Symantec reported 2,000 infected servers early Friday afternoon. That jumped to 3,500 by Friday evening, and 6,700 as of 2 a.m PT Monday.
Once infected, a computer drawn into the Slapper network can be ordered--by commands passed from machine to machine--to attack a target in one of four different ways: send out a deluge of data, force the target to execute a command, redirect certain requests to another computer, or send back e-mail addresses or information about known infected servers.