South Korea's judiciary said an external intrusion attempt first detected in February 2023 led to a deeper investigation with outside security specialists from December 2023. The review found that an attacker suspected of links to North Korea had likely used advanced techniques to enter the judiciary network and exfiltrate internal court data and documents. The Court Administration Office said it had taken privacy protection and other response measures and would continue follow up as more facts were confirmed. The incident prompted a wider review of judiciary network security and plans to strengthen the organization responsible for cyber defense.