The toxic ingredients of a cyberattack like the one North Korea is accused of unleashing on Sony Pictures are available in underground markets. Damian Dovarganes/AP hide caption

itoggle caption Damian Dovarganes/AP

A banner for The Interview is posted outside Arclight Cinemas, in the Hollywood section of Los Angeles on Wednesday. The theatrical release of the film has been cancelled following cyber attacks and threats believed to originate in North Korea. Damian Dovarganes/AP hide caption

itoggle caption Damian Dovarganes/AP

National Intelligence Director James Clapper waits for a hearing of the Senate Judiciary on Wednesday. Brendan Smialowski/AFP/Getty Images hide caption

itoggle caption Brendan Smialowski/AFP/Getty Images