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

December 19, 2025Thunder Bay Counselling listed by Medusaon the group's public leak site

Records: 50 Employees

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 259 disclosures indexed across all operators we track. Geographically, Thunder Bay Counselling 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

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Thunder Bay Counselling

Claimed by Medusa · listed 5 months ago

50 Employees

Records

Age

since listed · data leaked

Status timeline

Listed
Dec 19, 2025
Data leaked

At a glance

Group: Medusa
Status: Data leaked
Country: Canada
Sector: Public Sector
Listed on leak site: Dec 19, 2025
Records: 50 Employees

About the victim

AI dossier — public-source company profile

Thunder Bay Counselling is a counselling and mental health services organization based in Thunder Bay, Ontario, Canada. It likely provides therapeutic and psychological support services to individuals and families in the Thunder Bay region. Based on the name, it operates in the non-profit or public-sector mental health space common to Canadian community services.

Industry: Mental Health & Counselling Services

Attack summary

Severity: critical — Thunder Bay Counselling is a mental health services provider, meaning exfiltrated data is highly likely to include sensitive regulated client health/therapeutic records and PII. Publication of such data constitutes a critical breach of patient confidentiality under Canadian privacy law (PIPEDA/provincial equivalents), and the disclosed status is data_published.

The Medusa ransomware group claims to have attacked Thunder Bay Counselling and the disclosure status is marked as data_published, indicating exfiltration and publication of data. The specific data types and volume are not detailed in the truncated leak post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client mental health records
Personal identifying information (PII)
Staff/employee records
Organizational documents

What the group claims

Thunder Bay Counselling is a leading provider of personal and workplace support services, offering counselling, psychotherapy, education, and support to facilitate positive life changes. Their services cater to individuals, families, and businesses, addressing issues related to mental health, substance use, and workplace challenges. The organization is committed to providing accessible, high-quality care that respects the diverse needs of the community. With a focus on social inclusion and shared responsibility, Thunder Bay Counselling aims to promote individual and community wellness. The company headquarters is located in 544 Winnipeg Avenue, Thunder Bay, Ontario, P7B 3S7, Canada. 11-50 Employees

The leak post

captured from the group's site

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Sources

Leak posthttp://xfv4jzckytb4g3ckwemcny3ihv4i5p4lqzdpi624cxisu35my5fwi5qd.onion/detail?id=ac93272130172860ea2780db5f6e3306

Source

Indexed 5 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.