Santa Casa de Assis Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
Santa Casa de Assis was listed by thegentlemen ransomware group on December 24, 2025, after internal files were exfiltrated in a ransomware attack. Individuals who may have records with the organisation are advised to check for unusual account activity and consider changing passwords or enabling additional security measures.
What happened
The incident came to light through a listing on the threat actor’s leak site on December 24, 2025. Public records indicate that internal files were removed during the operation. No information has been released on the precise timing of the intrusion, the volume of data taken, the encryption status of systems, or any ransom demand. The organization has not issued a public statement confirming or disputing the claims.
The group behind it: thegentlemen
Thegentlemen is a ransomware operation that maintains a public leak site to list organizations it claims to have targeted. Such groups commonly employ double-extortion tactics, first encrypting systems and then threatening to publish stolen data if a ransom is not paid. The actor’s listings are presented by the group itself and remain unverified claims until corroborated by the victim or independent investigation.
Who is Santa Casa de Assis?
Santa Casa de Assis is a private health care provider founded in 1919 and located in Assis, São Paulo, Brazil. It holds the CEBAS certificate as a beneficent entity in social assistance and health. The institution operates a hospital complex that includes emergency services, maternity care, surgical and intensive care units, orthopedics, hemodynamics, laboratory diagnostics, and specialized clinics. Health care organizations routinely process patient records, clinical data, and administrative information that can include personal identifiers and medical histories.
The information in question
The only detail provided is that internal files were allegedly exfiltrated. The exact categories of data, file counts, or whether patient records were among the materials have not been disclosed. Organizations of this type typically hold patient identification data, medical histories, treatment records, and operational documents, but the specific contents of the exfiltrated material remain unconfirmed.
What's at stake
Individuals whose information may be involved face the possibility of identity misuse or targeted fraud if personal or medical details become public. The institution could encounter regulatory scrutiny under Brazilian data-protection rules and operational disruption if systems were encrypted. Both outcomes depend on the actual scope of the data, which is not yet known.
Were you affected?
Check any official statements issued by Santa Casa de Assis for guidance on next steps. Individuals can also monitor their financial accounts and medical statements for unusual activity.
- Review account statements and credit reports for unexpected entries.
- Enable multi-factor authentication on any patient portals or related services.
- Run a free exposure scan of your email address against known breach datasets.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by thegentlemen — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
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