SHINDO3
Yokosuka Gakuin
RansomwareSize not disclosed
LEAK CONFIRMEDFace or profile photo imagesRecovering
Open in the live monitor ▶- Disclosed
- Dec 18, 2025
- Detected
- Dec 2025
- Detection to disclosure
- 17 days
- Leak
- Leak confirmed
- Type
- Ransomware
- Status
- Recovering
- Security spend
- Not checked yet
- Compensation
- Not announced
What leaked
IdentityMultiple photos and videos (image)
Who is affected
- Students and others
Cause
Servers were breached from outside and traces of a malicious program being executed were found
Timeline
- In early December staff reported they could not access servers
- Date of the Security NEXT report
Response
- Forensic investigation
What you should do
- Check the company's notice to see if you're affected
Lessons for companies
- Offline backups with restore drills; segment the network
- Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
- Run red teaming and AI-assisted hardening, and publish how much you invest
Sources
- Security NEXT News · Dec 18, 2025