North Korea's Cyberwar Army

The FBI is warning businesses to be on the lookout for new disruptive malware, following a massive hacking attack at Sony Pictures. The attack disabled Sony's internal networks and email, forcing employees off their computers and to pen and paper to conduct business.

Attackers left the message "we've obtained all your internal data including your secrets and top secrets," on Sony screens, along with images of skulls and the notice, "Hacked by #GOP." The initials apparently belong to a group that calls itself "Guardians of Peace."

The tech news site Re/code is reporting today that details of the attack support the theory that it was carried out by North Korea. That country's government has been angry over the soon-to-be-released Sony film "The Interview."

The movie stars James Franco as the host of a late-night talk show and Seth Rogen as his buddy and the talk show's producer. They score an interview with North Korea's secretive ruler, Kim Jong-un. In a plot twist, the CIA ask the duo to assassinate Kim while they are in North Korea interviewing him.

Arik Hesseldahl of Re/code tells Here & Now's Lisa Mullins that North Korea has an extensive cyberwar army that has carried out major attacks on the country's enemies.