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 155 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

April 8, 2026Deaconess Health System listed by worldleakson 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, Deaconess Health System is reported in US, a country with 2,713 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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Deaconess Health System

Claimed by worldleaks · listed 1 month ago

42d

Age

since listed · data leaked

Status timeline

Listed
Apr 8, 2026
Data leaked

At a glance

Group: worldleaks
Status: Data leaked
Country: US
Sector: Healthcare
Listed on leak site: Apr 8, 2026

About the victim

AI dossier — public-source company profile

Deaconess Health System is a nonprofit regional health care organization headquartered in Evansville, Indiana, operating hospitals, clinics, and specialty care centers across the tri-state area of Indiana, Illinois, and Kentucky. Services include emergency care, oncology, cardiology, orthopedics, and behavioral health. It is one of the largest employers in southwestern Indiana and operates multiple hospital campuses.

Industry: Nonprofit Regional Healthcare
Address: 600 Mary St, Evansville, Indiana 47747
Founded: 1892

Attack summary

Severity: critical — Deaconess is a large regional healthcare system; a confirmed data publication from a healthcare provider almost certainly involves protected health information (PHI) and personally identifiable information (PII) at scale, meeting the threshold for critical severity under HIPAA-regulated medical data exposure.

The worldleaks group claims to have published data belonging to Deaconess Health System, with the disclosed status recorded as data_published. The leak post does not specify whether encryption occurred, but the public site prominently displays a 'Notice of Data Incident,' suggesting exfiltration of patient or organizational data.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient health records
Medical test results
Prescription information
Patient billing information
Employee records
MyChart portal data

Original description

AI-summarised, not from the leak post

Deaconess Health System is a nonprofit regional health care organization based in Evansville, Indiana, United States. It operates hospitals, clinics, and specialty care centers across the tri-state area of Indiana, Illinois, and Kentucky. Services include emergency care, oncology, cardiology, orthopedics, and behavioral health. Founded in 1892, it remains one of the largest employers in southwestern Indiana.

Sources

Victim sitedeaconess.com
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/0543941525

Source

Indexed 1 month 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.