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 9, 2026KUPER listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, KUPER is reported in DE, a country with 333 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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KUPER

Claimed by thegentlemen · listed 12 days ago

11d

Age

since listed · data leaked

Status timeline

Listed
May 9, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: DE
Sector: Not Found
Listed on leak site: May 9, 2026

About the victim

AI dossier — public-source company profile

Heinrich KUPER GmbH is a medium-sized, internationally active machinery manufacturer headquartered in Rietberg, Germany. The company develops and manufactures machines and systems for veneer processing, solid wood working, automated packaging technology, and special-purpose woodworking equipment. It serves the global wood, building materials, and furniture industries as a quality leader in veneer and adhesive technology.

Industry: Wood & Veneer Processing Machinery Manufacturing
Address: Heinrich KUPER GmbH, Rietberg, Germany
Employees: 120-190

Attack summary

Severity: high — Data has been confirmed as published by the threat actor, indicating successful exfiltration of business data from a mid-sized industrial machinery manufacturer; while no regulated personal data at scale is explicitly confirmed, the data_published status and operational business data exposure warrant a high severity classification.

The group 'thegentlemen' claims to have attacked KUPER and has published data (disclosed status: data_published), indicating exfiltration of company data. No specific ransom amount or data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Company business data
Internal documents

What the group claims

kuper.de Heinrich KUPER GmbH is an internationally active medium-sized company headquartered in Rietberg, Germany, with approximately 120–190 employees. The company specializes in developing and manufacturing machines and systems for veneer processing, solid wood working, automated packaging technology, and special-purpose woodworking equipment. As a quality leader in veneer and wood processing technology, KUPER serves customers worldwide with individualized solutions and comprehensive service support.

Sources

Victim sitekuper.de

Source

Indexed 12 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.