Was Humboldt hit by ransomware?

Humboldt was listed by the thegentlemen ransomware operation (Brazil), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the thegentlemen ransomware group?

thegentlemen is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Humboldt breach?

thegentlemen published data attributed to Humboldt. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Colégio Humboldt

listed as Humboldt · Claimed by Thegentlemen · listed 20 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedSep 15, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Brazil
Listed on leak site: Sep 15, 2026

About the victim

AI dossier — public-source company profile

Colégio Humboldt is Germany's official school in São Paulo, Brazil, founded in 1916 by German immigrants. It is a non-profit bilingual institution serving approximately 1,200–1,300 students (ages 2–18) across multiple educational tracks, including a dual German vocational training center (the largest outside Germany) offering internationally recognized certifications such as Abitur, DSD, Cambridge, and DELE.

Industry: International Education & Vocational Training
Address: Interlagos, São Paulo, Brazil (60,000 m² campus)
Employees: 295
Founded: 1916

Attack summary

Severity: high — Large-scale exfiltration (300 GB) of educational records involving minors and families constitutes significant PII exposure; schools are trusted custodians of sensitive child data, making this a material breach of regulated information.

The group claims to have exfiltrated approximately 300 GB of data from Colégio Humboldt. The breach exposes institutional and personal records from a school community spanning ages 2–18, including staff and families.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student records
Staff personnel files
Family/parent information
Educational records
Institutional administration data

What the group claims

humboldt.com.br zoominfo.com/c/humboldt/372537346 Colegio Humboldt 300gb DATA Germany's official school in São Paulo — founded in 1916 by German immigrants (first class: 41 students, May 1, 1916), now a non-profit bilingual school of ~1,200–1,300 students (ages 2–18, ~295 staff) on a 60,000 m² Interlagos campus built with German government funding (opened 1999), maintained by the parents' association SEBRB. Its dramatic history: closed twice by world wars — 1917 (WWI) and 1942 (WWII, when all assets were confiscated and took a 10-year legal battle to recover) — before parents rebuilt it into a top institution. Programs: two tracks (Bilingual — 40% German; International German — 80% German leading to the Abitur, with 100% pass rate and direct entry to German/European universities), plus DSD I/II, Cambridge, DELE certifications, and its crown jewel — the largest German dual vocational training center outside Germany (since 1982: 2-year technical programs in Administration, Logistics, IT.

Sources

Victim sitehumboldt.com.br

Source

Indexed 20 hours 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.

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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 868 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post September 15, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

September 15, 2026Humboldt listed by thegentlemen on the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 868 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

Geographically, Humboldt is reported in Brazil, a country with 209 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Humboldt appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CERT.br (Brazil), as required for your jurisdiction.
Monitor for the data appearing on thegentlemen's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.