Was DaVita hit by ransomware?

DaVita was listed by the Interlock 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 Interlock ransomware group?

Interlock 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 DaVita breach?

Interlock published data attributed to DaVita. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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DaVita

Claimed by Interlock · listed 1 year ago

14m

Age

since listed · data leaked

Status timeline

ListedApr 25, 2025
Data leakeddate unknown

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Apr 25, 2025

About the victim

AI dossier — public-source company profile

DaVita Inc. is a major provider of kidney dialysis services in the United States, operating outpatient dialysis centers and providing related laboratory services for patients with chronic kidney failure and end-stage renal disease (ESRD). The company offers multiple treatment modalities including in-center hemodialysis, home hemodialysis, peritoneal dialysis, and integrated care services, along with clinical research programs and transplant software.

Industry: Healthcare Services – Kidney Dialysis & Nephrology

Attack summary

Severity: critical — DaVita is a major healthcare provider handling protected health information (PHI) for chronic kidney disease and dialysis patients at scale. Healthcare data breaches involving patient records constitute regulated sensitive information under HIPAA. The company's size and scope of patient care (dialysis centers nationwide) indicates potential exposure of substantial volumes of PII and medical records.

The Interlock group claims to have attacked DaVita. The leak post does not specify the nature of the compromise (encryption, exfiltration, or both) or enumerate specific data categories compromised.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Lab test results
Treatment data
Personal identifiable information

What the group claims

DaVita Inc. provides kidney dialysis services for patients suffering from chronic kidney failure in the United States. The company operates kidney dialysis centers and provides related lab services in outpatient dialysis centers. It also offers outpatient, hospital inpatient, and home-based hemodialysis services; operates clinical laboratories that provide routine laboratory tests for dialysis and other physician-prescribed laboratory tests for ESRD patients; and management and administrative services to outpatient dialysis centers. In addition, the company offers integrated care and disease management services to patients in risk-based and other integrated care arrangements; clinical research programs; physician services; and comprehensive kidney care services. Further, it engages in the provision of acute inpatient dialysis services and related laboratory services; and transplant software business.

Sources

Victim sitedavita.com
Leak posthttp://523gzulwswe5tfevqlrxvqqh2fxo2mwrs2irnjel4mtu7qodgdu2ccyd.onion/index.php?p=

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 Interlock

Interlock is a recently emerged ransomware group that began operations in October 2024, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's country of origin and potential affiliations remain unclear given their recent emergence, with insufficient public documentation to determine whether they operate as an independent entity or under a Ransomware-as-a-Service model. Limited public information exists regarding their specific attack methodologies, initial access vectors, or encryption techniques, as major cybersecurity firms and law enforcement agencies have not yet published comprehensive technical analyses of their operations. Since beginning operations, Interlock has reportedly compromised approximately 100 victims, with their targeting primarily focused on organizations in English-speaking countries including the United States, Canada, United Kingdom, and Australia, as well as Italy, while demonstrating a preference for attacking education, manufacturing, healthcare, and public sector entities. The group remains active as of late 2024, though comprehensive threat intelligence profiles from established security research organizations have not yet been published due to the group's recent emergence in the threat landscape. The group has been linked to 114 public disclosures across our corpus. First observed on a leak site on October 13, 2024; most recent post July 10, 2026. The operation is currently active.

Timeline of this disclosure

April 25, 2025DaVita listed by Interlockon the group's public leak site

Other recent disclosures by Interlock

Interlock has been linked to 114 public victims on Darkfield. A sample of the most recent:

See the full Interlock 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, DaVita is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Interlock means DaVita 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 Interlock'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.