This record tracks a ransomware attack claimed by the
qilin group against
Columbia Medical Practice. 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.
-76days
t1 · Published
t2 · Disclosed
Business Category
Communication / Marketing
Published
November 25, 2025
Disclosed / Notified
Sep 11, 2025
Attack Summary
Columbia Medical Practice was named by the qilin ransomware group as a targeted organization. It operates in the Communication / Marketing sector. The affected entity is based in United States. The incident was first observed on November 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 cmpractice.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
213+
found in Traditional breaches
28+
found in Ransomware leaks
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
Televerde
play · ransomware
••• emails
Arandell Corp
medusa · ransomware
••• emails
PWC.COM
clop · ransomware
••• 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 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.