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Ransomware Victim Public Sector

Mairie Thiverval Grignon

Ransomware attack by Medusalocker Β· Disclosed July 1, 2026 Β· πŸ‡«πŸ‡· France

mairie-thiverval-grignon.fr

Date Disclosed
Jul 1, 2026
2026
Threat Group
Medusalocker
39 total victims
Country
πŸ‡«πŸ‡· France
Industry
Public Sector

Incident Analysis

Mairie Thiverval Grignon was targeted by Medusalocker ransomware, one of the most active ransomware groups in our database with 39 confirmed victims globally. The attack was disclosed on July 1, 2026, when Mairie Thiverval Grignon appeared on the group's dark web leak site.

Mairie Thiverval Grignon is based in France , operating in the Public Sector sector. France ranks #6 globally for ransomware attacks, with 492 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Medusalocker typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats β€” paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Aug 5, 2026 06:00 UTC.

Frequently Asked Questions

Was Mairie Thiverval Grignon attacked by ransomware?

Yes. Mairie Thiverval Grignon was listed as a victim of the Medusalocker ransomware group on July 1, 2026. The organisation is based in France and operates in the Public Sector sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Mairie Thiverval Grignon?

Mairie Thiverval Grignon was attacked by Medusalocker ransomware. Medusalocker is one of the most active ransomware groups, having claimed 39 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Mairie Thiverval Grignon ransomware attack occur?

The ransomware attack on Mairie Thiverval Grignon was disclosed on July 1, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Mairie Thiverval Grignon ransomware attack?

The specific data stolen from Mairie Thiverval Grignon has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Public Sector organisation, Mairie Thiverval Grignon likely held sensitive business data, client information, and operational records.

How can organisations protect against Medusalocker attacks?

To defend against Medusalocker and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.