Ransomware Knocks Out Japanese Clinic – 300,000 Patient Records Exposed
Feb. 27, 2025
🔴 Another day, another ransomware attack in Japan.
This time, it’s DIC Utsunomiya Central Clinic, where hackers locked down internal systems and stole 300,000 patient records.
🏥 No backups? No firewall?
The hospital’s entire electronic medical records (EMR) system went down, delaying treatment and causing chaos.
- ⚠️ Incident
Table of Contents

⚠️ Incident
📅 How It Happened
🛑 February 10, 2025:
- Clinic’s servers suddenly became inoperable.
- Doctors & nurses locked out of patient records.
- Investigation confirmed ransomware attack → immediate server shutdown.
- No emergency recovery plan in place.
💰 Were ransom demands made? No details released yet.
🔓 What Hackers Stole
📁 Estimated affected records: ~300,000
🏥 Patient Data: Name, birthdate, address, medical history
👨⚕️ Employee Data: Names, phone numbers, personal info
💳 No financial data leaked (yet).
🚨 Potential impact:
❌ Delayed medical care due to system outage
🔓 Stolen medical records could be sold on the dark web
🎣 Expect phishing scams targeting affected patients
🛠️ Damage Control: Too Late?
🏛️ Authorities involved:
📜 Personal Information Protection Commission
🏥 Ministry of Health, Labour and Welfare
👮 Police investigation ongoing
🔍 Cybersecurity experts now called in—but only after the damage was done.
⚠️ Patients Beware: Expect Phishing Scams
📩 Watch out for fake emails & phone calls claiming to be from the hospital.
🔍 Hackers often exploit leaked medical data to launch scams targeting victims.
🛡️ How to Avoid This Disaster
🏥 Healthcare providers, take note:
✅ Regular security audits (before you get hacked, not after)
✅ Offline backups (because ransomware loves online storage)
✅ Zero Trust security model (no, your password isn’t enough)
✅ Phishing awareness training (because clicking the wrong link can kill your systems)
🔚 Final Thoughts
Japan’s healthcare system is under siege.
This time, it’s Utsunomiya. Next time? Maybe Tokyo. Maybe your hospital.
💬 What do you think? Will Japan finally fix its cybersecurity before it’s too late?
📢 For the latest updates, visit the clinic’s official website.
🔗 Source: https://ucc.or.jp/2025/02/17259
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