SHINDO2

Osaka Regional Taxation Bureau

Total259records

LEAK CONFIRMEDPhishing · Closed (final report)

Open in the live monitor ▶
Disclosed
Apr 15, 2026
Detected
Apr 13, 2026
Detection to disclosure
2 days
Leak
Leak confirmed
Type
Phishing
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

UnspecifiedInformation on taxpayers under investigation

How many

  • Total 259 records
  • Individuals 179 records
  • Corporations 80 records

Who is affected

  • Taxpayers under investigation (individuals)
  • Taxpayers under investigation (corporations)

Cause

A person posing as a police officer showed what looked like a police ID on video, said the employee was under criminal suspicion and asked for work documents; the employee complied and sent them by LINE

Timeline

  1. A caller posing as Chiba Prefectural Police phoned the employee's personal mobile; the employee sent work documents by LINE the same day. Found out when the employee told colleagues
  2. Discovered after the employee told colleagues
  3. Announced (reported by MBS News and TBS NEWS DIG)

What you should do

  1. 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