South Korean reporting summarized a compromise affecting military-related systems after the Cyber Command and National Intelligence Service investigated whether other defense and foreign-security agencies were impacted. The excerpt says some military materials, including classified information, were confirmed leaked, partly because some PCs had not stored sensitive files according to required rules. A vaccine relay server was reportedly taken over, automatic security-program updates were stopped, and manual updates were used while investigators examined whether data could have crossed between Internet-connected and defense networks. The DIDC environment included file-sharing servers connected to both networks, and officials noted that similarity to methods previously judged by South Korea as North Korean-linked was part of the context.