This record tracks a ransomware attack claimed by the
thegentlemen group against
St Stephens International. 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.
107days
t1 · Published
t2 · Disclosed
Business Category
Education
Published
November 04, 2025
Disclosed / Notified
Feb 20, 2026
Attack Summary
https://www.zoominfo.com/c/st-stephens-international-school/1293733677 www.sis.edu St Stephens International School offers educational programs at its Bangkok and Khao Yai campuses, catering to a diverse student population. The school provides weekend schooling and various camps for groups, aiming to enhance the educational experience. It is associated with several organizations including Ocean Glass, Ocean Property, and Bandara Group. The institution focuses on fostering an international learning environment for its students
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.
Dark Web Exposure
Findings for zoominfo.com
— indexed by HaveIBeenRansom.
6,897
found in Infostealer logs
2,840+
found in Traditional breaches
160+
found in Ransomware leaks
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••• emails
CSCGLOBAL.COM
clop · ransomware
••• emails
contacts_103.csv
Database World ROC · breach
••• emails
Marcus & Millichap, Inc.
shinyhunters · breach
••• emails
+ 17 more leak sources locked
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Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.