Can good worms solve the Conficker problem?

After reading the latest news about Conficker, I was wondering: Would it be legal to create and deploy a super worm that had an anti-malware payload designed to shut down and prevent infections by other worms?

On the one hand, you'd be making unauthorized use of other people's computer systems, using their bandwidth, crossing state and national boundaries, and risking interfering with other operations. But on the other hand, you'd be doing them a favor to inoculate them; using the black hat's technique for good.

What do you think?

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