sesi.org.br Listed by lockbit5 Ransomware Group

On March 17, 2026, the Brazilian organization SESI had its internal files listed for download on the LockBit 5 ransomware leak site after a ransomware attack that exfiltrated company data.

What Public Reporting Shows

Public reporting indicates that SESI, which provides education, health, and cultural services across Brazil, suffered a ransomware incident in which attackers gained access to internal systems and removed files. The data was subsequently published on the LockBit 5 leak portal. The exact number of individuals whose personal information may have been exposed remains unknown, as does the precise volume and full contents of the stolen files. Available reporting describes the incident as a classic ransomware operation involving both encryption of systems and public extortion through data exposure.

Internal files were allegedly exfiltrated, though the specific types of records — such as employee details, student information, health data, or partner contracts — have not been independently verified in open sources. No confirmed timeline for the initial breach has been released beyond the March 17 publication date on the leak site.

Why This Matters for You and Your Family

When organizations like SESI are hit, ordinary families feel the impact. Many Brazilian families rely on SESI for schooling, medical services, or community programs. If your family has used any of these services, details such as names, addresses, dates of birth, contact information, or even health records could be among the stolen files. Once data leaves a legitimate organization and appears on a ransomware site, it circulates quickly among identity thieves, fraudsters, and doxxers.