An anonymous reader writes "The FBI launched a PR counterattack against skeptics of the assertion by the US government that North Korean hackers were responsible for anonymous threats received by Sony before its scheduled premiere of the film The Interview. Sony initially cancelled the Christmas day release, but later relented after receiving extensive criticism. In a speech at a New York City cybersecurity conference hosted by Fordham University, FBI Director James Comey said that while the attackers concealed their identify by using proxy servers, on occasion they "got sloppy" and made direct connections, exposing their true IP addresses; these indicated a North Korea origin. Comey also mentioned additional corroborative evidence, including patterns matching those seen in previous attacks known to have come from North Korea, but was guarded on details. Also at the Fordham conference, US Director of National Intelligence James Clapper mentioned recently meeting the Kim Yong Chol, the North Korean general in charge of cyberwarfare. Clapper emphasized Kim's belligerence and lack of a sense of humor, implying that an advance screening of "The Interview" would likely have enraged and provoked the North Korean brass."