This record tracks a ransomware attack claimed by the
clop group against
cps.k12.il.us. 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.
-44days
t1 · Published
t2 · Disclosed
Business Category
Education
Published
February 10, 2025
Disclosed / Notified
Dec 29, 2024
Attack Summary
[AI generated] cps.k12.il.us is the official website for Chicago Public Schools (CPS), one of the biggest school systems in the U.S., located in Chicago, Illinois. It provides comprehensive information about their various programs, curriculums, school calendars, resources for students and parents, as well as staff directories. CPS's mission is to provide a high-quality public education for every child, in every neighborhood, that prepares each for success in college, career, and civic life.
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 cps.k12.il.us
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
2,921+
found in Traditional breaches
79+
found in Ransomware leaks
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
Televerde
play · ransomware
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
Data4marketers) Special K Data Feed Spam List.part01.rar
Anonymous Russia БД · breach
••• emails
+ 4 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.