Nippon Medical School Musashi Kosugi Hospital

Nippon Medical School Musashi Kosugi Hospital was compromised in a ransomware attack attributed to netrunner in April 2026. The organization, operating in the Healthcare sector in Japan, was added to the group's data leak site as part of an extortion campaign.

netrunner operates as a financially motivated ransomware-as-a-service (RaaS) operation, exfiltrating sensitive data and threatening public disclosure to pressure victims into paying ransom demands.

Nippon Medical School Musashi Kosugi Hospital is a 372-bed regional teaching hospital in Nakahara-ku, Kawasaki (Musashi-Kosugi area), affiliated with Nippon Medical School. Established in 1937, it offers comprehensive services across 36 clinical departments, including emergency and critical care, ICU, NICU, perinatal and pediatric care, cancer treatment, and minimally invasive endovascular procedures. The hospital serves as a regional hub with disaster-resistant facilities and an on-site heliport, and emphasizes advanced, patient-centered care and medical education.