Disclosure context

About medusalocker

MedusaLocker is a ransomware group that emerged in November 2022, operating with primarily financial motivations and targeting organizations across multiple sectors including technology, energy, healthcare, and manufacturing. The group's origin and specific affiliations remain largely undocumented in public threat intelligence reports, though their operational patterns suggest they may operate as part of the broader ransomware-as-a-service ecosystem that has proliferated in recent years. With 51 documented victims primarily concentrated in the United States, United Arab Emirates, Germany, Canada, and Antigua and Barbuda, MedusaLocker appears to focus on opportunistic targeting rather than specific geographic or sectoral specialization. The group's attack methodology and specific technical capabilities have not been extensively documented by major threat intelligence organizations, though their targeting of critical infrastructure sectors including healthcare and energy suggests they likely employ common ransomware tactics such as network encryption and potential data exfiltration. No major high-profile attacks or significant law enforcement disruptions against MedusaLocker have been publicly reported by CISA, FBI, or other major security agencies. The current operational status of MedusaLocker remains unclear due to limited public documentation, though the relatively recent emergence date suggests the group may still be active or have transitioned to other operations. The group has been linked to 67 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Timeline of this disclosure

November 18, 2025dulay.ca listed by medusalockeron the group's public leak site

Data size: 500 GB
Ransom demanded: $40000

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, dulay.ca is reported in Canada, a country with 810 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

Dulay and Dulay

listed as dulay.ca · Claimed by medusalocker · listed 6 months ago

500 GB

Data size

$40000

Ransom

demanded

Age

since listed · data leaked

Status timeline

Listed
Nov 18, 2025
Data leaked

At a glance

Group: medusalocker
Status: Data leaked
Country: Canada
Sector: Technology
Listed on leak site: Nov 18, 2025
Data size: 500 GB
Ransom demanded: $40000

About the victim

AI dossier — public-source company profile

Dulay and Dulay is a professional accounting firm based in Mississauga, Ontario, serving clients across the Greater Toronto Area and Canada. The firm provides accounting and assurance, tax advisory, consulting, and financial services to a wide range of industries including healthcare, law firms, construction, real estate, and more. They operate a client portal for secure document and financial information access.

Industry: Accounting & Tax Advisory Services
Address: Unit 5, 1332 Khalsa Drive, Mississauga, Ontario, Canada

Attack summary

Severity: critical — An accounting and tax advisory firm holds highly sensitive regulated financial and personal data (PII, tax records, financial statements) for numerous business and individual clients across Canada; 500 GB of exfiltrated data from such a firm constitutes a large-scale breach of regulated and sensitive financial/PII data.

MedusaLocker claims to have exfiltrated approximately 500 GB of data from Dulay and Dulay and is offering the data for sale at $40,000, with the post indicating the deal includes options for profiting from the files.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client financial records
Tax documents
Accounting and assurance files
Business consulting records
Client personal information (PII)
Corporate financial data

What the group claims

Price-$40000 (sale in one hand there are options for making a profit from these files will be included in the deal) 500Gb

Sources

Victim sitedulay.ca
Leak posthttp://z6wkgghtoawog5noty5nxulmmt2zs7c3yvwr22v4czbffdoly2kl4uad.onion/?p=463

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.