SHINDO4

Oyatsu Company

Oyatsu Company, Ltd.

Personal data~170,000people

POSSIBLE LEAKPostal address / Phone numberUnauthorized access · Investigating

Open in the live monitor ▶
Disclosed
Mar 12, 2025
Leak
Leak possible
Type
Unauthorized access
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityFull name
ContactAddress, Phone number
Employment & HREmployee data stored in the attendance system

How many

  • Campaign winners, tasting survey participants and others ~170,000 people
  • Employees whose data was stored in the attendance system 450 people

Who is affected

  • Winners of the company's campaigns from 2012 to 2025
  • Customers who took part in tasting surveys from 2021 to 2024
  • Employees

Cause

Servers were hit by a cyberattack, causing a system failure on March 3

Timeline

  1. Date the system failure occurred
  2. Reported to authority
  3. Reported to authority
  4. Date of the Security NEXT report

What you should do

  1. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  2. Watch for unexpected mail or invoices; your address is hard to change
  3. Expect targeted phishing posing as HR or interview contacts
  4. 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