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MEDICUS SHUPPAN

thegentlemen

This record tracks a ransomware attack claimed by the thegentlemen group against MEDICUS SHUPPAN. 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.

-61days
t1 · Published t2 · Disclosed
Mar 21, 2026Jan 20, 2026
Country
Japan
Business Category
Healthcare / Pharma
Employees
51-100
Discovered
2026-03-21
Published
March 21, 2026
Disclosed / Notified
Jan 20, 2026
Victim ID
oI9En6c9pqQk

Attack Summary

medica.co.jp zoominfo.com/c/medicus-shuppan-co-ltd/463963337 is dedicated to providing enjoyable learning experiences for healthcare professionals through a variety of products and services, including seminar books and digital content. The company aims to support the education of medical practitioners and contribute to the future of healthcare. They also focus on sustainability and creating valuable content that serves as a backbone in the medical field. Their intended clients include healthcare professionals, authors, and bookstores

Leak Screenshots

SAMPLE

Proof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.

file_tree.png
finance_2024.xlsx
passport_scan.jpg
contract_signed.pdf
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Dark Web Exposure

Findings for medica.co.jp — indexed by HaveIBeenRansom.
29
found in Infostealer logs
65+
found in Traditional breaches
1+
found in Ransomware leaks
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Peatix_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
AntiPublic_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
LinkedIn.com.txt
Database World ROC · breach
••• emails
Exploit.in.rar
LKnet reserve chat · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum 🪾 · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
+ 12 more leak sources locked
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