SHINDO4

Hokkaido Jalan

Recruit Co., Ltd.

Membersup to104,000people

POSSIBLE LEAKDate of birth / Postal addressUnauthorized access · Investigating

Open in the live monitor ▶
Disclosed
Mar 21, 2025
Detected
Mar 19, 2025 08:00 JST
Detection to disclosure
2 days
Leak
Leak possible
Type
Unauthorized access
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityFull name, Gender, Date of birth, Nickname
ContactAddress, Phone number, Email address
CredentialsHashed password

Not leaked

  • The service does not hold credit card or bank account information

How many

  • Members up to 104,000 people

Who is affected

  • Hokkaido Jalan members

Cause

The Hokkaido Jalan system was attacked (method not stated in the article)

Timeline

  1. Detected
  2. Date of the Security NEXT report

Response

  • Phishing warning
  • Password reset

Warned about spoofed emails and urged members who reuse the same password elsewhere to change it

What you should do

  1. Change this password and every account that reused it now. Weak passwords crack even when hashed or encrypted. Switch to a passkey where offered
  2. Don't open links in emails from this company. The apology email itself may be fake
  3. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  4. Watch for unexpected mail or invoices; your address is hard to change
  5. 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