Was Kentfield Hospital hit by ransomware?

Kentfield Hospital 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 Kentfield Hospital breach?

worldleaks published data attributed to Kentfield Hospital. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Vibra Healthcare (Kentfield Hospital location)

listed as Kentfield Hospital · Claimed by Worldleaks · listed 1 year ago

11m

Age

since listed · data leaked

Status timeline

ListedJul 21, 2025
Data leakeddate unknown

At a glance

Group: Worldleaks
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Jul 21, 2025

About the victim

AI dossier — public-source company profile

Vibra Healthcare is a national operator of critical care hospitals, medical rehabilitation hospitals, and skilled nursing facilities founded in 2004. Kentfield Hospital is one of their long-term acute care and rehabilitation facilities, located in San Rafael and San Francisco, California, specializing in recovery from serious illnesses, surgeries, injuries, strokes, spinal cord and brain injuries, and cardiac/respiratory diseases.

Industry: Healthcare – Long-Term Acute Care, Medical Rehabilitation & Skilled Nursing
Address: San Rafael, California, United States (primary Kentfield location; Vibra Healthcare operates 16+ locations nationwide)
Employees: 1000+
Founded: 2004

Attack summary

Severity: critical — Healthcare sector breach involving a hospital system; patient medical records and PHI are regulated (HIPAA) sensitive data. Disclosure status 'data_published' indicates exfiltration and public release of patient information at a medical facility serving vulnerable populations.

The worldleaks group claims to have compromised Kentfield Hospital (a Vibra Healthcare facility) and published data. No specific details on encryption, exfiltration method, or operational disruption are provided in the leak post excerpt.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Personal health information (PHI)
Potentially financial/billing data

Original description

AI-summarised, not from the leak post

Kentfield Hospital is a long-term acute care and rehabilitation facility providing specialized care for patients recovering from serious illnesses, surgeries, and injuries. This includes treatment for conditions such as strokes, spinal cord and brain injuries, and respiratory and cardiac diseases. The hospital has locations in San Francisco and San Rafael in the U.S. state of California.

Sources

Victim sitewww.kentfieldhospital.com
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/8439943131

Source

Indexed 1 year 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

July 21, 2025Kentfield Hospital 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, Kentfield Hospital 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 Kentfield Hospital 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.