MRC de Maskinongé - district Listed by medusa Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On April 19, 2025, the Medusa ransomware group listed MRC de Maskinongé, a regional district authority in Quebec, Canada, as a victim of a ransomware attack involving the exfiltration of internal files. Public details remain limited: the number of people affected is unknown, and the precise contents of the stolen material have not been independently confirmed beyond the group's claim of 713.20 GB of data.

The listing indicates that internal files were taken during the attack. For residents, employees, and partner municipalities across the district, the incident raises practical questions about what information may now be in unauthorized hands and what steps can reduce any resulting risk.

Inside the incident

According to the available record, Medusa listed MRC de Maskinongé on its leak site on or around April 19, 2025. The group claims that 713.20 GB of internal files were exfiltrated in a ransomware attack. No further public confirmation of the intrusion method, the exact date of compromise, or whether systems were encrypted has been provided in the facts. The number of individuals whose data may have been involved is listed as unknown. The organisation has not publicly detailed the timeline or scope beyond what appears in the listing itself.

What is stated is that the material consists of internal files. No additional breakdown of file categories, systems affected, or ransom demands has been disclosed in the source material. As with many ransomware claims, the listing itself remains an assertion by the threat actor until independently verified.

Who is medusa?

Medusa is a well-documented ransomware group that operates a double-extortion model. After gaining access to a network, the group typically steals data and then encrypts systems, threatening to publish the stolen material on a dedicated leak site if a ransom is not paid. The group has been active for several years and has claimed responsibility for attacks against organisations in multiple sectors, including government, education, and private industry. Its operators commonly use publicly available tools and custom ransomware payloads, and they maintain a Tor-based site where they post victim names, sample files, and countdown timers.

In this case, Medusa has listed MRC de Maskinongé and claimed the exfiltration of 713.20 GB of internal files. That claim has not been independently verified in the provided facts, so it should be treated as an assertion by the group rather than confirmed fact.

Who is MRC de Maskinongé?

MRC de Maskinongé is a municipalité régionale de comté (regional county municipality) in the province of Quebec, Canada. It unites 17 municipalities covering an area of more than 2,600 square kilometres. Its district office is located at 760 Saint Laurent Blvd E, Louiseville, Quebec, J5V 1H9, and the organisation employs 83 people. Like other MRCs, it coordinates regional planning, economic development, land-use management, and certain shared municipal services for its member communities.

Because it sits at the intersection of local government and regional administration, an MRC typically holds records related to residents, municipal partners, employees, contractors, and public services. A breach at this level can therefore touch both internal administrative data and information that flows between the district and its 17 municipalities.

What was likely exposed

The facts state that internal files were exfiltrated and that the total volume claimed by Medusa is 713.20 GB. No specific categories of personal or sensitive data—such as names, addresses, financial records, or identity documents—have been named in the public record. Exact contents therefore remain unconfirmed.

Organisations of this type commonly hold employee personnel files, municipal correspondence, planning documents, financial and procurement records, and data shared with or about residents and partner municipalities. Whether any of those categories were among the 713.20 GB is not established. Until more detail is released by the organisation or verified by independent sources, the precise nature of the exposed material should be regarded as unknown.

Why it matters

For people whose information may have been among the internal files, the practical risks include potential misuse of personal or contact details, targeted phishing that references real organisational relationships, and longer-term identity or privacy concerns if sensitive records were included. Because the number of affected individuals is unknown, the scale of any individual impact cannot yet be measured.

For MRC de Maskinongé itself, the incident carries operational, reputational, and regulatory consequences. Regional authorities handle data that supports public services across multiple municipalities; any disruption or loss of control over that information can affect service continuity and public trust. The claimed volume of 713.20 GB suggests a substantial collection of material, even if its exact composition is not yet known. Recovery, notification obligations under Canadian privacy law, and any required remediation will demand resources and careful communication with residents and member municipalities.

If your data was in this claimed breach

If you live in or have dealt with MRC de Maskinongé or any of its 17 municipalities, treat the possibility of exposure seriously even while details remain limited. Monitor financial and government accounts for unexpected activity, be cautious of unsolicited emails or calls that reference the district or local services, and consider placing fraud alerts with credit bureaus if you believe sensitive personal information may have been involved. Change passwords on any accounts that reused credentials linked to the organisation, and enable multi-factor authentication wherever available.

You can also run a free exposure scan of your email address to check whether your information has already appeared in known breach data sets. Stay alert for any official notices from MRC de Maskinongé or Quebec privacy authorities, as they may provide more precise guidance once the scope of the incident is better understood.

AICompiled with AI assistance from public sources and published under our editorial standards.