Disclosure context

About Qilin

Qilin is a ransomware group that emerged in October 2022, operating with primarily financial motivations through targeted attacks against organizations across multiple sectors. The group appears to operate independently with limited public information available regarding their specific country of origin or affiliations to other ransomware families. Qilin employs double extortion tactics, typically exfiltrating sensitive data before deploying their encryption payload, though specific details about their initial access vectors and technical tools remain less documented in public security research. The group has demonstrated a broad targeting approach, with their 1645 known victims spanning multiple countries including the United States, France, Canada, United Kingdom, and Germany, with particular focus on manufacturing, technology, healthcare, and business services sectors. Based on available intelligence reporting, Qilin remains an active threat as of recent assessments, continuing their ransomware operations without significant reported law enforcement disruption. The group has been linked to 1,858 public disclosures across our corpus. First observed on a leak site on October 8, 2022; most recent post May 21, 2026. The operation is currently active.

Timeline of this disclosure

May 17, 2026Cooperativa de Hospitales de Antioquia - COHAN listed by Qilinon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Cooperativa de Hospitales de Antioquia - COHAN is reported in Colombia, a country with 14 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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Cooperativa de Hospitales de Antioquia - COHAN

Claimed by Qilin · listed 4 days ago

Age

since listed · listed for ransom

Status timeline

Listed
May 17, 2026

Current state: Listed for ransom

At a glance

Group: Qilin
Status: Listed for ransom
Country: Colombia
Sector: Healthcare
Listed on leak site: May 17, 2026

About the victim

AI dossier — public-source company profile

Cooperativa de Hospitales de Antioquia - COHAN is a healthcare cooperative based in Antioquia, Colombia, that groups and supports a network of hospitals and healthcare institutions in the region. The organization provides shared services, supply chain, and administrative support to its member hospitals. As a cooperative structure, it serves multiple healthcare facilities across the Antioquia department.

Industry: Healthcare Cooperative / Hospital Network

Attack summary

Severity: medium — The victim operates in the healthcare sector, which handles regulated and sensitive patient and administrative data. However, the post is a bare listing with no proof files, no confirmed exfiltration, and no data size disclosed, preventing a higher severity rating despite the sensitive sector.

The Qilin ransomware group has listed Cooperativa de Hospitales de Antioquia - COHAN as a victim on their leak site. The post represents an initial listing with no explicit detail on data exfiltrated, ransom demanded, or encryption confirmed.

medium

The leak post

captured from the group's site

[Australian College of Business Intelligence](http://ijzn3sicrcy7guixkzjkib4ukbiilwc3xhnmby4mcbccnsd7j2rekvqd.onion/site/blog?uuid=5ecb65aa-3960-4b61-ab37-802b4eb3d3d5)
[Cooperativa de Hospitales de Antioquia - COHAN](http://ijzn3sicrcy7guixkzjkib4ukbiilwc3xhnmby4mcbccnsd7j2rekvqd.onion/site/blog?uuid=bd0eebf4-e436-4f46-b7d8-0c21f8fff528)
[John G Yphantides A Professional Law](http://ijzn3sicrcy7guixkzjkib4ukbiilwc3xhnmby4mcbccnsd7j2rekvqd.onion/site/blog?uuid=1e464ce5-6e74-4e62-be0b-eac503e43af8)
Law Firms & Legal Services 
Law Firms & Legal Services

Sources

Source

Indexed 4 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.