Ceres Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On September 09, 2025, the research organisation Ceres was listed by the ransomware group known as thegentlemen. Public reporting indicates that internal files were claimed to have been exfiltrated in a ransomware attack, though the number of people affected remains unknown and further operational details have not been disclosed.

The listing itself is an unverified claim by the group. For an independent policy research centre that works with economic data and public-policy materials across Latin America, any confirmed exposure of internal files would raise concrete questions about the confidentiality of research work and the security of associated contacts.

What happened

According to available public information, Ceres appeared on a leak site associated with thegentlemen ransomware group on or around September 09, 2025. The group claims that internal files were exfiltrated during a ransomware attack. No confirmed figures for the volume of data, the precise date of initial access, the method of intrusion, or the number of individuals whose information may be involved have been released. Public detail on whether encryption was deployed, whether a ransom demand was issued, or whether any negotiation took place is limited.

The organisation’s public web presence includes the domains ceres.uy and www.ceres-uy.org. Beyond the group’s listing and the statement that internal files were taken, no independent confirmation of the full scope of the incident has been published in the materials reviewed for this report.

Inside thegentlemen

thegentlemen is a ransomware operation that has been observed conducting double-extortion campaigns: encrypting systems while also claiming to steal data and threatening to publish it if payment is not made. Public reporting on the group describes a pattern of targeting organisations across multiple sectors, posting victim names on dedicated leak sites, and using pressure tactics typical of contemporary ransomware crews. The group’s listings are claims; they do not by themselves constitute independent verification that a breach occurred or that the stated data was in fact obtained.

No statements attributed to thegentlemen that go beyond the listing of Ceres and the assertion of internal-file exfiltration are available in the facts of this incident. Prior activity by the group is documented in open sources as involving data theft and public shaming of victims, but those general patterns should not be read as confirmed specifics of the Ceres case.

Who is Ceres?

Ceres, formally the Centro de Estudios de la Realidad Económica y Social, is an independent, non-profit research centre focused on the economic analysis of Latin American economies, the design of public policies, and the promotion of debate at local and international levels. Its stated vision centres on growth with equality of opportunity; its mission is to contribute to generating and debating policy agendas that can promote economic and social development in the region.

Organisations of this type typically maintain internal research files, correspondence with policymakers and academics, donor or partner records, and working documents that may contain sensitive economic or personal data. A breach involving such an institution is consequential because the materials it holds can include unpublished analysis, contact information for researchers and officials, and other non-public information whose unauthorised disclosure could affect both the centre’s work and the individuals connected to it.

The information in question

The facts state that internal files were exfiltrated in a ransomware attack. No further breakdown of file types, document categories, or personal-data fields has been disclosed. Exact contents therefore remain unconfirmed.

Research centres of this kind commonly hold draft reports, economic datasets, internal correspondence, staff and collaborator contact details, and materials related to policy discussions. Whether any of those categories were among the files claimed by thegentlemen is not established by public reporting. Readers should treat any assertion of specific data elements beyond “internal files” as unverified.

What's at stake

If internal files were in fact taken, the practical risks include unauthorised access to research materials, potential exposure of personal or professional contact information, and the possibility that unpublished analysis or correspondence could be misused or published. For individuals whose details appear in such files, this can mean increased risk of targeted phishing, social-engineering attempts, or unwanted contact. For the organisation, the stakes include disruption of ongoing work, reputational questions, and the need to review access controls and incident-response procedures.

Because the number of people affected is unknown and the precise contents of the files are unconfirmed, the scale of individual impact cannot yet be quantified. The absence of confirmed detail does not eliminate risk; it simply means that affected parties must proceed on the basis of caution rather than certainty.

What to do if you're exposed

If you have a connection to Ceres—as staff, collaborator, donor, or research subject—consider the following practical steps while public detail remains limited:

• Monitor email and other accounts for unusual login attempts or phishing messages that reference the organisation or its research.
• Change passwords on any accounts that may have been used in connection with Ceres work, and enable multi-factor authentication where available.
• Treat unsolicited requests for information or payment that claim to relate to this incident with scepticism; verify through known official channels.
• Review financial and identity-protection settings if you believe personal data may have been involved, and consider placing fraud alerts if warranted by your circumstances.
• Run a free exposure scan of your email address to check whether your information has already appeared in known breach datasets.

Further official statements from Ceres or independent confirmation of the group’s claims would clarify the situation. Until then, measured personal vigilance remains the most useful response.

AICompiled with AI assistance from public sources and published under our editorial standards.