Over the holiday weekend, a concerted cyber attack disrupted computers at several U.S. government agencies, including the websites of the Treasury, the Secret Service, the Federal Trade Commission, and the Department of Transportation. Officials say it was a sophisticated hack that required more expertise than your average cyber assailant. Meanwhile, South Korea's computers were also hacked with a "denial of service" virus. The crimes were remarkably similar, raising speculation about the source of the crime. For more of the story, The Takeaway talks to Siobhan Gorman, the Wall Street Journal's intelligence correspondent