SHINDO2

Yamato Transport

Yamato Transport Co., Ltd.

yamato-hd.co.jp

Unauthorized accessSize not disclosed

POSSIBLE LEAKCredit / debt data / Postal addressInvestigating

Open in the live monitor ▶
Disclosed
Sep 29, 2026
Detected
Sep 28, 2026
Detection to disclosure
1 day
Leak
Leak possible
Type
Unauthorized access
Status
Investigating
Security spend
Measures, no amount
Compensation
Not announced
Corporate number
1010001092605

What leaked

IdentityFull name, Names of employees in charge
ContactAddress, Phone number, Email address
Financial & paymentCredit approval number, Billed amount, Outstanding balance
Transactions & activityItem details
Business dataMerchant name and merchant code

Who is affected

  • Pay-later service users
  • Merchants
  • Employees

Cause

Unauthorized access by a third party (cause and scope under investigation)

Timeline

  1. Detected
  2. Kuroneko Daikin Atobarai (pay-later) service suspended
  3. First disclosure
  4. Company issued an update

Response

  • Forensic investigation
  • Notified individuals
  • Service stopped

Investigation with security experts, individual contact with affected people, stronger security and development of measures to prevent recurrence

What you should do

  1. Don't open links in emails from this company. The apology email itself may be fake
  2. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  3. Watch for unexpected mail or invoices; your address is hard to change
  4. Expect targeted phishing posing as HR or interview contacts
  5. 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