This record tracks a ransomware attack claimed by the
safepay group against
jumonji-u.ac.jp. It collects the publicly disclosed attack details — sector, location and
timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAP
Window Zero is the time the breach stayed in the open before
anyone said so — the gap between when the attack was first discovered
on the operator's leak site (t1) and when it was publicly disclosed (t2).
The wider this window, the longer victims, staff and customers were exposed with no warning.
0days open
t1 · Published
t2 · Pending
Business Category
Education
Indexed by Breach House
October 31, 2026
Disclosed / Notified
Not disclosed yet
Attack Summary
jumonji-u.ac.jp is an educational institution based in Japan, operating within the education sector and providing academic and institutional services. The entity has been cataloged in this threat-intelligence index under the listing type ransomware victim. Its inclusion reflects an assessed association with the threat actor safepay, which is documented as the linked source for this entry. No specific incident details such as data stolen, record counts, ransom demands, or confirmed breach evidence are provided here to maintain factual neutrality. This listing serves to index the entity within the ransomware victim category for cybersecurity research and defensive awareness. The entry supports threat-intelligence workflows focused on identifying and tracking affected organizations across sectors and geographies.
Leak Screenshots
1 CAPTURED
Captured directly from the operator's leak site by our collector, last checked 2026-10-31. Verdict evidence: [S1] SafePay own post links the published dump server (http://dwizzpmqny2ddazasljow3cdd4doqscouwywd3gz5jbsxvzerqx3lwid.onion/jumonji/)
Showing the latest capture only
Unlock the daily capture history — up to 45 days of evidence.
Dark Web Exposure
Findings for jumonji-u.ac.jp
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
285+
found in Traditional breaches
1+
found in Ransomware leaks
Full Clouds Cit0day_2.7z.001
DBs w MTDT · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
2844Breaches_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
+ 17 more leak sources locked
Leak volumes are locked
Sign in to reveal how many records each source exposed and the remaining 20 sources.
Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house only records what the operators themselves publish in the
open. We take screenshots of their public pages and keep the proof
material they post there, so that a listing can be verified and its status
tracked over time. We do not purchase data, we do not solicit or encourage
its publication, we do not access any private system, and we do not alter
anything we record. Nothing is offered for download here, and detailed
content is not published on this page or anywhere else on the public site:
access to it is restricted to vetted customers under contract, for
incident response, due diligence and cyber-resilience work.
Breach.house is not affiliated with, and does not act on behalf of, the
operators who publish this material. If you represent an organisation or
individual named here and want a record reviewed or removed, contact us
and we will act on it.
