Who is the kazu ransomware group?

kazu is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

Ransomware victim disclosure

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Doctor Alliance

Q: What data was leaked in the Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers breach?

kazu published data attributed to Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers. Darkfield captured the leak post and a screenshot of the listing.

listed as Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers · Claimed by Kazu · listed 8 months ago

Age

since listed · data leaked

Status timeline

ListedNov 11, 2025
Data leakeddate unknown

At a glance

Group: Kazu
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Nov 11, 2025

About the victim

AI dossier — public-source company profile

Doctor Alliance is a US-based company providing streamlined document and billing management services for healthcare providers. The company operates as a third-party administrative services vendor, handling medical billing, documentation, and related back-office functions on behalf of healthcare practices. As a healthcare support services provider, it likely handles sensitive patient and provider financial data.

Industry: Healthcare Revenue Cycle & Document Management

Attack summary

Severity: critical — Doctor Alliance handles medical billing and document management for healthcare providers, meaning exfiltrated data almost certainly includes regulated PII and protected health information (PHI) covered under HIPAA. Data_published status indicates exfiltrated data has been released, constituting a critical breach of sensitive healthcare and financial records at scale.

The group 'kazu' claims to have attacked Doctor Alliance and has published data (disclosed status: data_published), though the leak post content is minimal and does not detail whether encryption or exfiltration occurred. Given the data_published status, exfiltration of company and potentially patient-related billing and document data is implied.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Medical billing records
Patient documentation
Healthcare provider records
Financial/payment data
Administrative documents

What the group claims

Doctor Alliance (doctoralliance.com) is a U.S.-based healthcare technology platform that helps physicians and medical agencies manage documents, referrals, and billing in one secure online system. Headquartered in Dallas, Texas, it offers services such as electronic document signing, coordination with agencies, and billing support for programs like CPO, CCM, and TCM. The platform integrates with systems like Axxess Home Health to streamline workflow and reduce paperwork, promoting faster document turnaround and improved billing efficiency -- contact me to protect your files !!

The leak post

captured from the group's site

Apache/2.4.65 (Debian) Server at 6czlbd2jfiy6765fbnbnzuwuqocg57ebvp3tbm35kib425k4qnmiiiqd.onion Port 80

Sources

Victim sitedoctoralliance.com
Leak posthttp://6czlbd2jfiy6765fbnbnzuwuqocg57ebvp3tbm35kib425k4qnmiiiqd.onion/ransom.html#Doctor

Source

Indexed 8 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 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 14 public disclosures across our corpus. First observed on a leak site on November 11, 2025; most recent post May 27, 2026. The operation is currently active.

Timeline of this disclosure

November 11, 2025Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers listed by kazuon the group's public leak site

Other recent disclosures by kazu

kazu has been linked to 14 public victims on Darkfield. A sample of the most recent:

See the full kazu 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, Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by kazu means Doctor Alliance – Streamlined Document and Billing Management for Healthcare Providers 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 kazu'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.