Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 424 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post May 18, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

May 6, 2026Colegio Notre Dame Campinas listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, Colegio Notre Dame Campinas is reported in BR, a country with 189 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Colegio Notre Dame Campinas

Claimed by thegentlemen · listed 15 days ago

14d

Age

since listed · data leaked

Status timeline

Listed
May 6, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: BR
Sector: Education
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

Colégio Notre Dame is a private Catholic school founded in 1961 in Campinas, São Paulo, Brazil, by the Congregation of Holy Cross. It offers education from kindergarten through secondary school (Ensino Infantil to Ensino Médio) as well as international curriculum programs. It is considered one of the most recognised private schools in the Campinas region.

Industry: Private K-12 Catholic Education
Address: Campinas, São Paulo, Brazil
Employees: 51-200
Founded: 1961

Attack summary

Severity: high — Data is marked as published (data_published), meaning exfiltration is claimed to have been completed and released. A K-12 educational institution holds regulated PII for minors (students) and staff, making any confirmed publication of that data a serious concern warranting a high severity rating.

The group 'thegentlemen' claims to have published data belonging to Colégio Notre Dame Campinas, with the disclosure status recorded as data_published. No specific details on encryption or the precise categories of exfiltrated data are stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

School administrative records
Student data
Staff/employee data

What the group claims

notredamecampinas.com.br zoominfo.com/c/colégio-notre-dame-campinas/460150468 Colégio Notre Dame is a private Catholic school founded in 1961 in Campinas, São Paulo, Brazil, by the Congregation of Holy Cross. The school offers education from kindergarten through secondary school (Ensino Infantil to Ensino Médio), as well as international curriculum programs. With over 12,000 Instagram followers and 51–200 employees, it is one of the most recognized private schools in the Campinas region. Its motto — "educating minds and hearts" — reflects its mission to combine academic excellence with Catholic values

Sources

Victim sitenotredamecampinas.com.br

Source

Indexed 15 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.