SHINDO2

Tottori Prefecture Environmental Radiation Monitoring System

Tottori Prefecture

Personal data0records

NO LEAK FOUNDRansomware · Investigating

Open in the live monitor ▶
Disclosed
Sep 3, 2026
Detected
Sep 2, 2026 03:30 JST
Detection to disclosure
1 day
Leak
No leak
Type
Ransomware
Status
Investigating
Security spend
Measures, no amount
Compensation
Not announced

Not leaked

  • There is no confidential or personal information in the system

How many

  • Personal data (none held in the system) 0 records

Cause

The main monitoring station (main server) inside the prefectural office was hit by ransomware; files on the server were encrypted and the system stopped (entry route under investigation)

Timeline

  1. The prefecture's nuclear safety website announced that measurement data updates were suspended
  2. An automatic email to the staff member triggered checks; the outage and encryption were confirmed that morning
  3. First disclosure

Response

  • Blocked the entry point
  • Forensic investigation

Communication paths were cut. The system maintenance contractor is analysing logs to find the cause, with the prefectural CSIRT and the prefectural police cybercrime division

What you should do

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

Lessons for companies

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

Sources