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

December 6, 2025CT Dent Ltd 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, CT Dent Ltd is reported in United Kingdom, a country with 902 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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CT Dent Ltd

Claimed by kazu · listed 6 months ago

Age

since listed · data leaked

Status timeline

Listed
Dec 6, 2025
Data leaked

At a glance

Group: kazu
Status: Data leaked
Country: United Kingdom
Sector: Healthcare
Listed on leak site: Dec 6, 2025

About the victim

AI dossier — public-source company profile

CT Dent Ltd is an independent CBCT (cone beam computed tomography) dental imaging centre established in 2007 and headquartered in London, UK. The company operates multiple locations across England, including sites in London, Bristol, Birmingham, Nottingham, Leeds, Manchester, and Colchester, providing CBCT scans, OPG X-rays, CEPH X-rays, digital impressions, and radiology reports. Their services are used by over 10,000 UK dental practices for treatment planning and diagnostics.

Industry: Dental Imaging & Radiology Services
Address: 109 Harley Street, London W1G 6AN, United Kingdom
Founded: 2007

Attack summary

Severity: critical — CT Dent holds medical imaging data (DICOM, CBCT scans, X-rays) and associated patient records for over 10,000 UK dental practices, constituting regulated health/medical PII at significant scale under UK GDPR and NHS CQC frameworks. Data has been published, confirming exfiltration of sensitive medical data.

The ransomware group kazu claims to have compromised CT Dent Ltd, with the disclosure status indicating data has been published. Given the nature of the business, the data at risk includes patient dental scan records and associated medical imaging data held on behalf of thousands of referring dental practices across the UK.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient dental scan records
CBCT imaging data
OPG X-ray files
DICOM files
Patient referral information
Radiology reports
Digital impression data
Dental practitioner/client records

What the group claims

CT Dent Ltd is an independent CBCT imaging centre based in London, UK, specializing in dental CT scanning services that are utilized by over 10,000 UK practices. The company offers a range of imaging services, including CBCT scans, OPG X-rays, and digital impressions, along with advanced technologies like dose reduction to ensure patient safety. Their target clients include dental practitioners in need of reliable and detailed imaging for treatment planning and diagnostics. Established in 2007, CT Dent has become a leading provider in the dental imaging sector

Sources

Victim sitewww.ct-dent.co.uk

Source

Indexed 6 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.