Out of curiousity, does anyone know any serious or credible infosec figures who believe the attacks were perpetrated by North Korea? All I've heard confirming

Out of curiousity, does anyone know any serious or credible infosec figures who believe the attacks were perpetrated by North Korea? All I've heard confirming this is from MPAA "cyberterrorism experts." And George Clooney, whose statement regarding the Nixon origins of the name "Guardians of Peace is also unverifiable.