SHINDO3

Ota Kumin Plaza

Ota City Cultural Promotion Association

Staff and facility users556people

POSSIBLE LEAKFull namePhishing · Contained

Open in the live monitor ▶
Disclosed
Sep 4, 2026
Leak
Leak possible
Type
Phishing
Status
Contained
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityNames and other details

How many

  • Staff and facility users 556 people

Who is affected

  • Staff
  • Facility users

Cause

While browsing on an office PC, a staff member followed the instructions of the contact shown on a fake warning screen, and the PC came under remote control (tech-support scam)

Timeline

  1. Staff member followed the fake warning screen's instructions
  2. First disclosure

Response

  • Blocked the entry point
  • Staff training

Disconnected the PC from the network and continues to investigate; reinforcing security awareness and proper handling

What you should do

  1. Expect targeted phishing posing as HR or interview contacts
  2. 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