This record tracks a ransomware attack claimed by the
worldleaks group against
Kentfield Hospital. 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.
-31days
t1 · Published
t2 · Disclosed
Business Category
Healthcare / Pharma
Disclosed / Notified
May 13, 2025
Attack Summary
[AI generated] Kentfield Hospital is a long-term acute care and rehabilitation facility providing specialized care for patients recovering from serious illnesses, surgeries, and injuries. This includes treatment for conditions such as strokes, spinal cord and brain injuries, and respiratory and cardiac diseases. The hospital has locations in San Francisco and San Rafael in the U.S. state of California.
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 kentfieldhospital.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
8
found in Traditional breaches
17
found in Ransomware leaks
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••• emails
McGraw Hill, Inc. (mheducation.com)
shinyhunters · breach
••• emails
H&H Group
medusa · ransomware
••• emails
DELTADENTAL.COM
clop · ransomware
••• emails
HomeChef_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
MGM_Grand_Hotels RUTOR.7z
TheUnderground - Reborn · breach
••• emails
HomeChef_BF.7z
Database World ROC · breach
••• emails
+ 3 more leak sources locked
Leak volumes are locked
Sign in to reveal how many records each source exposed and the remaining 6 sources.
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.