SHINDO2

Tokyo Keiki Inc.

PhishingSize not disclosed

LEAK UNCLEARMessages / email bodiesInvestigating

Open in the live monitor ▶
Disclosed
Apr 27, 2026
Leak
Unknown
Type
Phishing
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced

What leaked

Communications & contentMessages and contacts

Who is affected

  • Employees
  • The accounts' contacts

Cause

A phishing attack let a third party misuse employees' business chat accounts

Timeline

  1. First disclosure

Response

  • Revoked credentials
  • Phishing warning
  • Forensic investigation

Disabled the affected accounts and strengthened security; investigating facts and scope; warned contacts about suspicious messages

What you should do

  1. You can be affected without ever using this service (parcel recipients etc.). Check any notice you receive
  2. Expect targeted phishing posing as HR or interview contacts
  3. Check the company's notice to see if you're affected

Lessons for companies

  1. Passkeys or MFA for every account; monitor leaked credentials and rotate API keys
  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