Disclosure context

About kazu

The Kazu ransomware group is a relatively new threat actor that emerged in November 2025, operating with apparent financial motivations based on their targeting patterns across multiple sectors and geographic regions. Given their recent emergence and limited public documentation, details about their country of origin and potential affiliations remain unclear, though their targeting of diverse international victims suggests either a ransomware-as-a-service model or an independent operation with broad reach capabilities. With only nine documented victims to date, specific details about Kazu's attack methodology, initial access vectors, and encryption techniques have not been extensively documented by major threat intelligence organizations, though their targeting spans healthcare, public sector, financial services, and technology organizations across the United States, Colombia, South Africa, Nigeria, and Great Britain. The group's recent emergence means there are no widely reported major campaigns or high-profile incidents documented by established security research organizations like Mandiant, CISA, or the FBI. As of the latest available intelligence, Kazu appears to remain active given their very recent first observation date, though their limited victim count and recent emergence make definitive assessments of their operational status preliminary. The group has been linked to 12 public disclosures across our corpus. First observed on a leak site on November 11, 2025; most recent post May 20, 2026. The operation is currently active.

Timeline of this disclosure

January 26, 2026zHealthEHR — Practice Management Software for Chiropractic & Wellness Clinics listed by kazuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 2,524 disclosures indexed across all operators we track. Geographically, zHealthEHR — Practice Management Software for Chiropractic & Wellness Clinics is reported in United States, a country with 7,392 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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zHealth EHR

listed as zHealthEHR — Practice Management Software for Chiropractic & Wellness Clinics · Claimed by kazu · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Jan 26, 2026
Data leaked

At a glance

Group: kazu
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Jan 26, 2026

About the victim

AI dossier — public-source company profile

zHealth EHR is a US-based cloud-hosted electronic health record (EHR) and practice management software platform designed primarily for chiropractors and wellness clinic providers. The platform integrates clinical documentation (SOAP notes), appointment scheduling, patient intake, billing, payments, and automated reminders into a single subscription-based system. It serves thousands of small to mid-size chiropractic and wellness practices across the United States.

Industry: Healthcare IT / Electronic Health Records (EHR) Software
Employees: 11-50

Attack summary

Severity: critical — zHealth EHR is a multi-tenant cloud platform storing regulated PHI (HIPAA-covered health records, clinical notes, billing, and payment data) for thousands of chiropractic and wellness practices across the US. A confirmed data publication by the threat actor implicates large-scale exposure of protected health information and financial data spanning the entire customer base, meeting the threshold for critical severity.

The ransomware group 'kazu' claims to have compromised zHealth EHR and published data (disclosed status: data_published). Given zHealth's role as a cloud-based EHR platform handling patient health records, clinical notes, billing, and payment data for thousands of wellness practices, the breach potentially exposes protected health information (PHI) and financial data at scale across its entire client base.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient health records (PHI)
SOAP clinical notes
Appointment scheduling data
Patient intake forms
Billing records
Payment information
Patient contact information
Practice management data

What the group claims

zHealthEHR is a cloud-based electronic health record (EHR) and practice management platform built primarily for chiropractors and other wellness providers. It combines clinical documentation, appointment scheduling, patient intake, billing, payments, and automated reminders into a single system, helping small to mid-size practices streamline daily operations. The platform focuses on ease of use, customizable SOAP notes, and patient engagement tools, allowing providers to reduce administrative workload and run their clinics more efficiently through a subscription-based software model.

Sources

Victim sitewww.zhealthehr.com

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.