SHINDO2

Hatena Co., Ltd.

PhishingSize not disclosed

LEAK UNCLEARClosed (final report)

Open in the live monitor ▶
Disclosed
Apr 24, 2026
Detected
Apr 21, 2026 11:08 JST
Detection to disclosure
3 days
Leak
Unknown
Type
Phishing
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

UnspecifiedThe possibility that on-screen information was seen during the remote session cannot be ruled out

Who is affected

  • Corporate officer

Cause

A fraud group posing as Chiba Prefectural Police contacted an officer under the pretext of a money laundering investigation, had him install a remote-control app on his work PC, and directed two-factor authentication steps and transfers

Timeline

  1. Intrusion began
  2. Intrusion began
  3. Detected
  4. Reported to authority
  5. Contained
  6. First disclosure
  7. Company issued an update
  8. Company issued an update

Response

  • Governance / committee
  • Staff training

Published an investigation report (public version) on July 24 and prevention measures on July 31

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