Was Madison Healthcare Services hit by ransomware?

Madison Healthcare Services was listed by the worldleaks ransomware operation (United States), 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 worldleaks ransomware group?

worldleaks 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 Madison Healthcare Services breach?

worldleaks published data attributed to Madison Healthcare Services. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Madison Healthcare Services

Claimed by Worldleaks · listed 10 months ago

Age

since listed · data leaked

Status timeline

ListedSep 23, 2025
Data leakeddate unknown

At a glance

Group: Worldleaks
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Sep 23, 2025

About the victim

AI dossier — public-source company profile

Madison Healthcare Services (MHS) is a community-based healthcare organization located in Madison, Minnesota. It provides a broad range of medical and wellness services including primary care, emergency services, surgical services, behavioral health, imaging, laboratory, and senior/assisted living care. The organization serves as an all-in-one local healthcare hub for the surrounding rural community.

Industry: Rural Community Healthcare Services
Address: 900 2nd Avenue, Madison, MN 56256

Attack summary

Severity: critical — The victim is a healthcare provider subject to HIPAA; data_published status confirms exfiltration and public release of data that almost certainly includes protected health information (PHI), personal medical records, and potentially financial data of patients and residents at scale.

The worldleaks group claims to have exfiltrated data from Madison Healthcare Services and has published the data (disclosed status: data_published). The specific categories of data stolen have not been detailed in the leak post, but the victim is a healthcare provider handling patient and resident records.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient records
Resident care data
Financial/billing information
Employee information
Appointment and medical history data

Original description

AI-summarised, not from the leak post

Madison Healthcare Services is a US-based healthcare organization located in Madison, Minnesota. They offer an array of health services such as hospital care, assisted living, home health, and clinic services. They are dedicated to delivering comprehensive medical services and providing a nurturing environment for their residents, patients, and clientele. The organization also emphasizes health education and community outreach.

Sources

Victim sitewww.mhsmn.org
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/3970341507

Source

Indexed 10 months 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 worldleaks

Based on the limited available data, worldleaks is a recently emerged ransomware group that was first observed in May 2025 and appears to be primarily financially motivated, having claimed 134 victims in a relatively short timeframe since its emergence. The group's origin and organizational structure remain unclear, with no publicly documented information from major cybersecurity firms or law enforcement agencies regarding their country of origin, potential affiliations, or operational model. Their targeting patterns indicate a focus on English-speaking countries, particularly the United States, United Kingdom, and Canada, with additional activity observed in Germany and Japan, while their sector targeting shows a preference for healthcare, technology, manufacturing, and consumer services organizations. Due to the group's recent emergence and limited public documentation by established threat intelligence sources, specific details about their attack methodologies, encryption techniques, extortion tactics, and notable campaigns have not yet been comprehensively analyzed or reported by organizations such as CISA, FBI, or major cybersecurity research firms. The group appears to remain active as of the most recent observations, though comprehensive threat intelligence profiling awaits further analysis and documentation by established cybersecurity authorities. The group has been linked to 173 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post July 2, 2026. The operation is currently active.

Timeline of this disclosure

September 23, 2025Madison Healthcare Services listed by worldleakson the group's public leak site

Other recent disclosures by worldleaks

worldleaks has been linked to 173 public victims on Darkfield. A sample of the most recent:

See the full worldleaks 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, Madison Healthcare Services is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by worldleaks means Madison Healthcare Services 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, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on worldleaks'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.