Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 568 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post February 14, 2026. The operation is currently active.

Also tracked as: MedusaLocker.

Timeline of this disclosure

November 18, 2025dulay.ca listed by Medusaon 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 Medusa · 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: Medusa
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 broad range of industries including healthcare, law, 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 a large number of business and individual clients across Canada. 500 GB of exfiltrated data from such a firm constitutes a critical-scale breach of regulated and sensitive financial/personal information.

Medusa claims to have exfiltrated approximately 500 GB of data from Dulay and Dulay, with the data listed for sale at $40,000. The post indicates data has been published or is available for purchase.

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 portal data
Potentially personally identifiable information (PII)

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

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.