Skip to content
Cyber Threat
CTI Academy Sponsor CTI Academy
Ransomware victim Healthcare

Lessard Dental

Listed by Beast on · organisation based in Canada

www.lessarddental.com

Disclosed
Apr 24, 2026
Leak-site listing date
Threat group
Beast
73 victims listed
Country
Canada
#3 most targeted
Sector
Healthcare

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Beast. Figures and technique mappings are quoted from the source data, not inferred.

About the Beast group

Beast is a Ransomware-as-a-service (RaaS) product which provides functionality such as SMB scanning, file encryption, service and process starting and stopping, and geographic identification to avoid encryption in CIS countries. Beast has listed 73 victims since December 2023.

Incident analysis

Lessard Dental was listed by Beast ransomware, a group with 73 victims recorded in this database. The listing appeared on the group's leak site on April 24, 2026.

Lessard Dental is based in Canada and operates in the Healthcare sector. Canada ranks #3 worldwide for ransomware disclosures, with 975 victims in this database.

Sector context. Healthcare organisations are high-value ransomware targets because patient data is extremely sensitive, regulatory penalties for breaches are severe, and operational downtime can threaten patient safety — all factors that increase ransom payment pressure.

Beast typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was Lessard Dental attacked by ransomware?

Yes. Lessard Dental was listed as a victim of the Beast ransomware group on April 24, 2026. The organisation is based in Canada and operates in the Healthcare sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Lessard Dental?

Lessard Dental was attacked by Beast ransomware. Beast is one of the most active ransomware groups, having claimed 73 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Lessard Dental ransomware attack occur?

The ransomware attack on Lessard Dental was disclosed on April 24, 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 Lessard Dental ransomware attack?

The specific data stolen from Lessard Dental 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 Healthcare organisation, Lessard Dental likely held patient records, medical data, and personally identifiable information (PII).

How can organisations protect against Beast attacks?

To defend against Beast 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.