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Cyber Threat
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Ransomware victim Business Services

Sternthal Montigny Greenberg St-Germain

Listed by Brotherhood on · organisation based in Canada

www.smgs.ca

Disclosed
Oct 10, 2025
Leak-site listing date
Threat group
Brotherhood
18 victims listed
Country
Canada
#3 most targeted
Sector
Business Services

ThreatAI analysis

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

About the Brotherhood group

Brotherhood is a ransomware group that emerged in late 2025, targeting organizations in the US, Canada, and Australia across manufacturing, communications, and construction sectors, operating a Tor-based double-extortion leak site. Brotherhood has listed 18 victims since April 2025.

Incident analysis

Sternthal Montigny Greenberg St-Germain was listed by Brotherhood ransomware, a group with 18 victims recorded in this database. The listing appeared on the group's leak site on October 10, 2025.

Sternthal Montigny Greenberg St-Germain is based in Canada and operates in the Business Services sector. Canada ranks #3 worldwide for ransomware disclosures, with 980 victims in this database.

Sector context. Business services firms often have access to multiple client environments, making them high-value pivot points for ransomware operators seeking to maximise impact across multiple victim organisations.

Brotherhood 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 Sternthal Montigny Greenberg St-Germain attacked by ransomware?

Yes. Sternthal Montigny Greenberg St-Germain was listed as a victim of the Brotherhood ransomware group on October 10, 2025. The organisation is based in Canada and operates in the Business Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Sternthal Montigny Greenberg St-Germain?

Sternthal Montigny Greenberg St-Germain was attacked by Brotherhood ransomware. Brotherhood is one of the most active ransomware groups, having claimed 18 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Sternthal Montigny Greenberg St-Germain ransomware attack occur?

The ransomware attack on Sternthal Montigny Greenberg St-Germain was disclosed on October 10, 2025. 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 Sternthal Montigny Greenberg St-Germain ransomware attack?

The specific data stolen from Sternthal Montigny Greenberg St-Germain 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 Business Services organisation, Sternthal Montigny Greenberg St-Germain likely held sensitive business data, client information, and operational records.

How can organisations protect against Brotherhood attacks?

To defend against Brotherhood 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.