Stories by: Paul Roberts

For DuPont, Gary Min may have seemed a model employee. A research chemist at DuPont's research laboratory in Circleville, Ohio, Min was a naturalized U.S. citizen with a doctorate from the University of Pennsylvania who had worked for DuPont for 10 years, even earning a business degree from Ohio State University with help from his employer. But Min's veneer of respectability began to crack on Dec. 12, 2005, when he told his employer he would be leaving his job.

Online scams that lure online banking and e-commerce customers to phony Web sites and trick them into giving up sensitive account information have been a mainstay of online criminals for years. However, the increase in so-called spear-phishing attacks is new, as is the increasing sophistication of the software they use to penetrate enterprise networks.