Was Unimed Belem hit by ransomware?

Unimed Belem was listed by the Ransomexx 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 Ransomexx ransomware group?

Ransomexx 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 Unimed Belem breach?

Ransomexx published data attributed to Unimed Belem. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Unimed Belem

Claimed by Ransomexx · listed 4 years ago

45m

Age

since listed · data leaked

Status timeline

ListedOct 19, 2022
Data leakeddate unknown

At a glance

Group: Ransomexx
Status: Data leaked
Country: Brazil
Sector: Healthcare
Listed on leak site: Oct 19, 2022

About the victim

AI dossier — public-source company profile

Unimed Belém is a medical cooperative and part of the Unimed System, the largest cooperative healthcare network in Brazil and worldwide, serving over 19 million clients through 368 medical cooperatives. The Unimed System operates across 83% of Brazilian territory, with more than 110,000 physicians and 3,244 accredited hospitals. Unimed Belém is the regional cooperative serving the Belém metropolitan area in the state of Pará, Brazil.

Industry: Healthcare Cooperative & Medical Insurance
Address: Belém, Pará, Brazil

Attack summary

Severity: critical — The victim is a healthcare cooperative handling regulated medical and personal data for millions of patients and tens of thousands of corporate clients; the status is data_published, confirming exfiltration of sensitive PII and likely protected health information (PHI) at significant scale.

The RansomExx group claims to have attacked Unimed Belém and has published data (disclosed status: data_published), indicating exfiltration of data from a major Brazilian healthcare cooperative that holds sensitive patient and corporate client information.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient health records
Corporate client data (73,000+ companies)
Medical cooperative member information
Physician records
Insurance/healthcare plan data

What the group claims

A Unimed é a maior realidade cooperativista na área da saúde em todo o mundo e também a maior rede de assistência médica do Brasil, presente em 83% do território nacional. O Sistema nasceu com a fundação da Unimed Santos (SP) pelo Dr. Edmundo Castilho, em 1967, e hoje é composto por 368 cooperativas médicas, que prestam assistência para mais de 19 milhões de clientes e 73 mil empresas em todo País. Clientes Unimed contam com mais de 110 mil médicos, 3.244 hospitais credenciados, além de pronto-atendimentos, laboratórios, ambulâncias e hospitais próprios e credenciados para garantir qualidade na assistência médica, hospitalar e de diagnóstico complementar oferecidos.

Sources

Leak posthttp://rnsm777cdsjrsdlbs4v5qoeppu3px6sb2igmh53jzrx7ipcrbjz5b2ad.onion/bf556546f62cfb3158f96e1746f6098acac0dff3/

Source

Indexed 4 years 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 Ransomexx

RansomEXX is a financially motivated ransomware operation that emerged in May 2020, targeting organizations across multiple sectors with a focus on extracting ransom payments through encryption and data theft tactics. The group is believed to operate independently rather than as a Ransomware-as-a-Service model, with suspected ties to Russian-speaking cybercriminals based on code analysis and operational patterns observed by security researchers. RansomEXX operators typically gain initial access through exploiting public-facing applications, particularly targeting vulnerable VPN appliances and remote desktop services, before deploying their custom ransomware payload which uses strong encryption algorithms and is often preceded by data exfiltration to enable double extortion schemes where stolen data is threatened to be publicly released if ransom demands are not met. The group has been responsible for several high-profile attacks including incidents against government entities and major corporations, with documented cases involving ransoms in the millions of dollars, though specific victim details are often kept confidential by affected organizations. Based on recent threat intelligence reporting, RansomEXX continues to maintain active operations as of 2024, with ongoing campaigns targeting the technology and healthcare sectors primarily in the United States and Europe. The group has been linked to 86 public disclosures across our corpus. First observed on a leak site on May 14, 2020; most recent post June 20, 2026. The operation is currently inactive.

Also tracked as: Ransom X, Defray777, Defray-777, Defray 2018.

Timeline of this disclosure

October 19, 2022Unimed Belem listed by Ransomexxon the group's public leak site

Other recent disclosures by Ransomexx

Ransomexx has been linked to 86 public victims on Darkfield. A sample of the most recent:

See the full Ransomexx dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,600 disclosures indexed across all operators we track. Geographically, Unimed Belem is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Ransomexx means Unimed Belem 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 Ransomexx'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.