SHINDO1

Nara City Hospital

UnknownSize not disclosed

NO LEAK FOUNDClosed (final report)

Open in the live monitor ▶
Disclosed
Apr 22, 2026
Detected
Apr 21, 2026 22:15 JST
Detection to disclosure
1 day
Leak
No leak
Type
Unknown
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

Who is affected

  • Patients

Cause

Abnormal network traffic thought to be a cyberattack; the cause and method were not disclosed

Timeline

  1. Abnormal traffic thought to be a cyberattack detected; major failure of the electronic medical record system
  2. Emergency and outpatient care suspended
  3. Reported and announced
  4. Electronic medical records back online
  5. Outpatient, inpatient and emergency care resumed
  6. All systems, including online insurance eligibility checks, fully restored

Response

  • Service stopped

Shut systems down, suspended emergency and outpatient care and continued treatment with paper records

What you should do

  1. Check the company's notice to see if you're affected

Lessons for companies

  1. Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
  2. Run red teaming and AI-assisted hardening, and publish how much you invest

Sources