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, 2026Mundo Amtae 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, Mundo Amtae is reported in MX, a country with 52 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

← All victims

Mundo Amtae

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: MX
Sector: Not Found
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

Mundo AMTAE (Asociación Mutual de Trabajadores Estatales) is one of Argentina's top 5 mutual aid organizations, founded in 1987 and headquartered at Lavalle 3155, Buenos Aires. It serves over 100,000 members across 20 branches nationwide, providing healthcare, dental, financial, and social services to state workers, retirees, and the general public. Its offerings include medical and dental care, ambulance services, loan programs, and tiered membership plans.

Industry: Mutual Aid & Social Health Services
Address: Lavalle 3155, Buenos Aires, Argentina
Founded: 1987

Attack summary

Severity: critical — The organization holds regulated sensitive data including health/medical records and financial information for over 100,000 members, including state workers and retirees. Data is confirmed published (data_published status), constituting exfiltration of PII and medical data at significant scale.

The group 'thegentlemen' claims a data disclosure attack against Mundo AMTAE, with the status listed as data_published, indicating exfiltration and publication of data. No specific ransom demand or data size was stated in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Member personal records
Health and medical service records
Financial assistance and loan data
State worker and retiree data
Membership plan details

What the group claims

mundoamtae.com zoominfo.com/c/mundo-amtae/372405633 Mundo AMTAE (Asociacion Mutual de Trabajadores Estatales) is one of Argentina's top 5 mutual aid organizations, founded in 1987 and headquartered at Lavalle 3155, Buenos Aires. With over 30 years of experience and 100,000 members spread across 20 branches nationwide, the organization provides a broad range of social, health, and financial services to state workers, retirees, and the general public. Its core offerings include medical consultations across all specialties, dental care, clinical analysis, physiotherapy, home medical visits, 24/7 ambulance service, and optical coverage. AMTAE also offers loan programs and financial assistance, with tiered membership plans (Plata, Dorado, Platino) covering varying levels of healthcare and personal accident protection

Sources

Victim sitemundoamtae.com

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.