When Roger Duronio, a former UBS PaineWebber Inc. systems administrator, was charged last week with planting a so-called logic bomb on the financial-services company's network, it once again highlighted the difficulties businesses face securing systems from insiders who turn bad. Federal prosecutors last week said Duronio bought UBS put options with the hope that the company's stock price would fall as a result of damage caused by the logic bomb, software code designed to harm computer systems. On March 4, the indictment contends, the bomb went off and damaged files on more than 1,000 of UBS's computers. Chief security officers say it's very difficult to protect business-technology systems from trusted employees. "If someone [on the inside] is brazen enough, there's not much you can do. You've got to trust people," says a security officer at a major financial-services firm.
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