This record tracks a ransomware attack claimed by the
lockbit5 group against
sesi.org.br. 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.
-59days
t1 · Published
t2 · Disclosed
Business Category
NGOs / Associations
Disclosed / Notified
Jan 09, 2026
Attack Summary
SESI provides quality education, health, and cultural services aimed at improving the quality of lif...
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 sesi.org.br
— indexed by HaveIBeenRansom.
6,076
found in Infostealer logs
1,676+
found in Traditional breaches
3+
found in Ransomware leaks
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
Unimed do Brasil
sarcoma · breach
••• emails
Leaked Database Archive_2.7z.001
formaceft_db · breach
••• emails
ModernBusinessSolutions_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
TAPAir_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
AntiPublic_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
LinkedIn.com.txt
Database World ROC · breach
••• emails
+ 17 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.