This record tracks a ransomware attack claimed by the
medusa group against
Concremat constructions. 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.
1107days open
t1 · Published
t2 · Pending
Business Category
Construction / Real Estate
Disclosed / Notified
Not disclosed yet
Attack Summary
Founded in 1972 and headquartered in Rio de Janeiro, Concremat Companies provides construction and engineering services. The company offers services such as urban and regional development studies, environmental management systems, and a sustainable development plan for territories
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 concremat.com.br
— indexed by HaveIBeenRansom.
143
found in Infostealer logs
2,995+
found in Traditional breaches
5+
found in Ransomware leaks
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
contacts_97.csv
Database World ROC · breach
••• emails
TAPAir_BF_.7z.001
Database World ROC · breach
••• emails
TAPAir_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · 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.