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 13 public disclosures across our corpus. First observed on a leak site on November 11, 2025; most recent post May 21, 2026. The operation is currently active.

Timeline of this disclosure

May 17, 2026HealthDaq listed by kazuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, HealthDaq is reported in Ireland, a country with 7 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

← All victims

HealthDaq

Claimed by kazu · listed 4 days ago

Age

since listed · listed for ransom

Status timeline

Listed
May 17, 2026

Current state: Listed for ransom

At a glance

Group: kazu
Status: Listed for ransom
Country: Ireland
Sector: Healthcare
Listed on leak site: May 17, 2026

About the victim

AI dossier — public-source company profile

HealthDaq is a Dublin-based healthcare recruitment platform operating in Ireland. The company appears to facilitate the matching or placement of healthcare professionals, functioning as a digital marketplace or data-driven platform within the healthcare staffing sector. No further detail is available from a public site.

Industry: Healthcare Recruitment & Staffing
Address: Dublin, Ireland

Attack summary

Severity: high — HealthDaq operates in healthcare recruitment, meaning exfiltrated data likely includes sensitive personal and professional information (CVs, identity documents, health credentials) about healthcare workers and possibly patients or clients — regulated personal data at meaningful scale. No proof has been published yet, but the nature of the platform makes potential exposure high-severity.

The group 'kazu' claims a data breach against HealthDaq, asserting exfiltration of data from the Dublin-based healthcare recruitment platform. No ransom amount, data volume, or proof files are specified in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Healthcare recruitment platform data
Candidate/professional records (inferred)
Client/employer records (inferred)

What the group claims

Dublin based healthcare recruitment platform

The leak post

captured from the group's site

A847 8A8C E2A4 3B58 FB12 D678 3BA4 C334 C85C EE56
HealthDaq Dublin based healthcare recruitment platform Data Breach
Spain - HT Médica Data breach
Peru - Natclar (S.G. Natclar S.A.C.)
SA - Gauteng Provincial Government
Statistics South Africa – Official National Data and Insights Portal

Sources

Leak posthttp://6czlbd2jfiy6765fbnbnzuwuqocg57ebvp3tbm35kib425k4qnmiiiqd.onion

Source

Indexed 4 days 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.