How to study malware? Write some >:D

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Ledin insists that his students mean no harm, and can't cause any because they work in the computer equivalent of biohazard suits: closed networks from which viruses can't escape. Rather, he's trying to teach students to think like hackers so they can devise antidotes. "Unlike biological viruses, computer viruses are written by a programmer.
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If college students can beat these antivirus programs, he argues, what good are they for the people and businesses spending nearly $5 billion a year on them? Antivirus software makers say Ledin's critique is misleading, and that they are a step ahead of him—and the hackers
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Article here.