Ransomware attack on SGI Seoul Guarantee causes four-day system outage

The ransomware attack targeted SGI Seoul Guarantee Insurance on July 14, 2026, resulting in a complete system outage that lasted four days. The incident prevented the company from issuing guarantees during the outage period. This follows a similar June 2026 attack on Yes24, another major South Korean online platform, indicating a surge in ransomware attacks targeting Korean companies [11].