This record tracks a ransomware attack claimed by the
qilin group against
Madera County Superintendent of Schools. 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.
-73days
t1 · Published
t2 · Disclosed
Business Category
Education
Published
December 25, 2025
Disclosed / Notified
Oct 14, 2025
Attack Summary
Madera County Superintendent of Schools was named by the qilin ransomware group as a targeted organization. It operates in the Education sector. The affected entity is based in United States. The incident was first observed on December 25, 2025. Breach House catalogues this incident from publicly available leak-site data; no stolen files are hosted here.
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 mcsos.org
— indexed by HaveIBeenRansom.
1
found in Infostealer logs
192+
found in Traditional breaches
23+
found in Ransomware leaks
McGraw Hill, Inc. (mheducation.com)
shinyhunters · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Televerde
play · ransomware
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
PENS.COM
clop · ransomware
••• emails
Canva_BF_.7z.001
Database World ROC · breach
••• emails
Canva_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
UnderArmour_BF_.7z.001
Database World ROC · breach
••• emails
+ 12 more leak sources locked
Leak volumes are 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.