Advisories
Osaka Metropolitan University Ransomware Attack Halts 500 Servers, Cancels Classes
A suspected ransomware attack disabled 500 servers at Osaka Metropolitan University, shutting down internal network, email, and key academic systems, forcing class cancellations. The incident exposed personal data of ~130,000 users and prompted investigation by external specialists. Defenders should review ransomware defenses, ensure backups, and monitor for similar disruptions.
What happened
Late last week, Osaka Metropolitan University (OMU) experienced a suspected ransomware attack that knocked out roughly 500 servers. The attack disabled the university’s internal network, email, and a suite of administrative and academic services, prompting a campus‑wide class cancellation.
Impact
Systems for academic administration, financial accounting, payroll, HR, library services, and the university’s websites were affected. About 130,000 students, faculty, and staff may have had personal data—names, addresses, email addresses—exposed, though a data breach has not yet been confirmed. The university hospital’s electronic medical records and veterinary center remained operational, and entrance‑exam application services were unaffected because they run on external servers.
What to do
- Verify that backups are intact and can be restored quickly.
- Run a full inventory of affected servers and assess whether ransomware signatures are present.
- Implement or review endpoint protection and network segmentation to contain future attacks.
- Notify relevant data‑protection authorities if personal data is confirmed to have been exfiltrated.
- Communicate transparently with stakeholders about recovery timelines.
Response
OMU has engaged external cybersecurity specialists and reported the incident to Japan’s data protection authority and other government agencies. The university plans to resume in‑person classes by Friday, with online services pending full system recovery.
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