After careful investigation, the United States is publicly attributing the massive WannaCry cyber attack to North Korea. We do not make this allegation lightly. We do so with evidence, and we do so with partners. Other governments and private companies agree. The United Kingdom, Australia, Canada, New Zealand, and Japan have seen our analysis, and they join in denouncing North Korea for WannaCry.
Last week, Microsoft and Facebook and other major tech companies acted to disable a number of North Korean cyber exploits and disrupt their operations as the North Koreans were still infecting computers across the world.