One of the scarier realities about malicious software is that these programs leave ultimate control over victim machines in the hands of the attacker, who could simply decide to order all of the infected machines to self-destruct. Most security experts will tell you that while this so-called “nuclear option” is an available feature in some malware, it is hardly ever used. Disabling infected systems is counterproductive for attackers, who generally focus on hoovering as much personal and financial data as they can from the PCs they control. But try telling that to Roman Hüssy, a 21-year-old Swiss information technology expert, who last month witnessed a collection of more than 100,000 hacked Microsoft Windows systems tearing themselves apart at the command of their cyber criminal overlords. Hüssy oversees Zeustracker, a Web site listing Internet servers that uses Zeus, a kit sold for about $700 on shadowy cyber criminal forums to harvest