Wasn't a patch to fix this vulnerability released in May of last year?
The virus-like attack, which began about 12:30 a.m. EST, sought out vulnerable computers on the Internet to infect using a known flaw in popular database software from Microsoft Corp. called "SQL Server 2000." The attacking software was scanning for victim computers so randomly and so aggressively, sending out thousands of probes a second, that it saturated many Internet data pipelines.
Most home users did not need to take any protective measures.
The attack sought to exploit a software flaw discovered by researchers in July 2002 that permits hackers to seize control of corporate database servers. Microsoft deemed the flaw to be critical and offered a free repairing patch, but it was impossible to know how many computer administrators applied the fix.