SHINDO5

Murata Manufacturing Co., Ltd.

Total~88,000records

LEAK CONFIRMEDHealth / medical / treatment / Bank accountUnauthorized access · Closed (final report)

Open in the live monitor ▶
Disclosed
Mar 6, 2026
Detected
Feb 28, 2026
Detection to disclosure
6 days
Leak
Leak confirmed
Type
Unauthorized access
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityFull name
ContactEmail address, Phone number
Financial & paymentBank account information
Special-care dataHealth information
Business dataInvoices, contracts and sales data of some business partners

How many

  • Total ~88,000 records
  • Employees, family members and retirees ~73,000 records
  • Outside contacts (customers and suppliers) ~15,000 records

Who is affected

  • Employees
  • Family members
  • Retirees
  • Customers and suppliers

Cause

Data theft through unauthorized access to an internal information-sharing system

Timeline

  1. Initial detection
  2. First report
  3. Second report
  4. Third (final) report

Response

  • MFA
  • More monitoring
  • Phishing warning

Strengthened authentication, widened monitoring and set up outside monitoring of data circulating online. Warned business partners about phishing, targeted attacks and business email compromise

What you should do

  1. Scammers who know your account number pose as refund staff. No bank or company asks for your PIN
  2. Health data can't be taken back. Don't answer blackmail; call the police (#9110) or the consumer hotline (188)
  3. Don't open links in emails from this company. The apology email itself may be fake
  4. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  5. Expect targeted phishing posing as HR or interview contacts
  6. Check the company's notice to see if you're affected

Lessons for companies

  1. Don't keep ID or bank data: delete after checks or use a KYC provider
  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