Was Modoc Medical Center hit by ransomware?

Modoc Medical Center 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 Modoc Medical Center breach?

worldleaks published data attributed to Modoc Medical Center. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Modoc Medical Center

Claimed by Worldleaks · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 16, 2026
Data leakeddate unknown

At a glance

Group: Worldleaks
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Feb 16, 2026

About the victim

AI dossier — public-source company profile

Modoc Medical Center (MMC) is a critical access hospital located in Alturas, California, serving Modoc County and surrounding rural communities since 1951. It operates an 8-bed acute care hospital, a 50-bed skilled nursing facility across two campuses, family practice clinics in Alturas and Canby, a retail pharmacy, and ancillary services including emergency care, surgery, radiology, laboratory, and physical therapy. MMC is the primary healthcare provider for a rural northeastern California county bordering Oregon and Nevada.

Industry: Critical Access Hospital & Rural Healthcare
Address: 1111 N. Nagle Street, Alturas, CA 96101
Founded: 1951

Attack summary

Severity: critical — Modoc Medical Center is a rural critical access hospital handling regulated health data (HIPAA-covered PHI) for an entire county. The data_published status indicates exfiltration and public release of data from a healthcare provider, which by definition involves sensitive medical and personal records of patients at scale, meeting the threshold for critical severity.

The worldleaks group claims to have attacked Modoc Medical Center and has published data (disclosed status: data_published), though the leak post does not specify whether encryption, exfiltration, or both occurred, nor does it detail the volume or type of data released. The public site references a 'Notice of Data Event,' corroborating that an incident affecting the organization has been acknowledged.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Personal identifiable information (PII)
Billing and financial records
Employee records
Clinical/laboratory data
Pharmacy records
Insurance and Medicare/Medicaid data

Original description

AI-summarised, not from the leak post

Modoc Medical Center is a healthcare service provider in Alturas, California. It offers a wide range of medical services, including a 24-hour emergency department, surgery, laboratory services, radiology, physical rehabilitation and more. It also houses a skilled nursing facility, provides primary and specialty care through its clinics. The center aims to deliver the highest quality healthcare in Modoc County.

Sources

Victim sitemodocmedicalcenter.org
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/2110812573

Source

Indexed 4 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 167 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post June 11, 2026. The operation is currently active.

Timeline of this disclosure

February 16, 2026Modoc Medical Center listed by worldleakson the group's public leak site

Other recent disclosures by worldleaks

worldleaks has been linked to 167 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 1,780 disclosures indexed across all operators we track. Geographically, Modoc Medical Center is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

If your organisation is affected

A listing by worldleaks means Modoc Medical Center 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.
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.