SHINDO2

Nihon Shisan Soken

RansomwareSize not disclosed

POSSIBLE LEAKInvestigating

Open in the live monitor ▶
Disclosed
May 14, 2026
Leak
Leak possible
Type
Ransomware
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced

What leaked

UnspecifiedInformation entrusted by customers and others

Not leaked

  • No impact on systems or data of Aoyama Zaisan Networks or other group companies

Who is affected

  • Customers
  • Related parties

Cause

Outside ransomware access encrypted files on its systems

Timeline

  1. First disclosure

Response

  • Service stopped
  • Forensic investigation

Set up a joint task force with the parent company and outside experts; shut down systems and PCs

What you should do

  1. Check the company's notice to see if you're affected

Lessons for companies

  1. Offline backups with restore drills; segment the network
  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