Security firms say attacks were carried out using previously known vulnerabilities and exploits. Analysts say the real lesson is that organizations have to address the vulnerabilities that leave them exposed. North Korea has so far remained silent about the attacks, said James Lewis, a senior fellow at the Center for Strategic and International Studies in Washington. The attacks have prompted South Korea’s military to raise its information surveillance status up by one level in response to the attacks. South Korean official: Disruptions at media operations appear to have been caused by a virus distributed as a software update.”]
Source: https://www.csoonline.com/article/2133116/south-korea-cyberattacks-hold-lessons-for-u-s-.html