SHINDO2

Daisen Co., Ltd.

RansomwareSize not disclosed

LEAK UNCLEARInvestigating

Open in the live monitor ▶
Disclosed
Aug 3, 2026
Leak
Unknown
Type
Ransomware
Status
Investigating
Security spend
Not checked yet
Compensation
Not announced

What leaked

UnspecifiedWhether data including personal information was taken, and its extent, is under investigation

Cause

Internal systems were accessed from outside and infected with malware

Timeline

  1. Unauthorized access occurred
  2. All systems cut off
  3. First disclosure
  4. Listed as "DAISEN" on the Ailock leak site (ransomware.live)

Response

  • Service stopped
  • Forensic investigation

Cut off all systems; working with an outside security firm to scope the impact, find the entry point and analyze logs

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