When it comes to criminal hackers, establishing motive is usually a no-brainer: In a majority of cases, computer worms and viruses are little more than tools that bad guys use to make money. But every so often, a prolific and sophisticated worm or virus emerges that isn’t so obviously connected to a financial scheme. Almost every time this happens, people start to get nervous and spin wild theories about the threat, until the hype surrounding said threat starts to reach a fever pitch. This is exactly what’s happening with the latest version of the worm dubbed “Conficker,” a contagion that has infected millions of PCs worldwide. Computers already infected by the worm are supposed to be automatically updated with some unknown software component on April Fools Day. That’s more or less the sum of what computer experts know about the rhyme or reason behind this worm, but it hasn’t stopped