North Korea has denied involvement in the attacks on Sony and others, instead accusing South Korea of disrupting its websites. Advertisement Continue reading the main storyThe Polish episode provides a case study of how North Korean cyberattack goals have escalated. South Korean cybersecurity officials began detecting attacks attributed to North Korean hackers around 2009. While North Korea lags developed countries in hacking capabilities, it has occasionally startled observers in South Korea. North Korean hackers have also begun using ransomware — viruses that encrypt all data in an infected computer or smartphone — to make money.

Source: New York Times March 25, 2017 18:56 UTC