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Cyber Threat
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Ransomware victim Business Services

Katz Kantor Stonestreet & Buckner

Listed by Kairos on · organisation based in United States

katzkantor.com

Disclosed
Mar 3, 2026
Leak-site listing date
Threat group
Kairos
107 victims listed
Country
United States
#1 most targeted
Sector
Business Services

ThreatAI analysis

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

About the Kairos group

Kairos is a data extortion group active since late 2024 that focuses solely on data theft with no encryption, primarily targeting small-to-mid-sized organizations in healthcare, manufacturing, and business services in the US, purchasing initial access from brokers and demanding Bitcoin payments. Kairos has listed 100 victims since June 2024.

Incident analysis

Katz Kantor Stonestreet & Buckner was listed by Kairos ransomware, a group with 107 victims recorded in this database. The listing appeared on the group's leak site on March 3, 2026.

Katz Kantor Stonestreet & Buckner is based in United States and operates in the Business Services sector. United States ranks #1 worldwide for ransomware disclosures, with 10,308 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.

Kairos 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 Katz Kantor Stonestreet & Buckner attacked by ransomware?

Yes. Katz Kantor Stonestreet & Buckner was listed as a victim of the Kairos ransomware group on March 3, 2026. The organisation is based in United States and operates in the Business Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Katz Kantor Stonestreet & Buckner?

Katz Kantor Stonestreet & Buckner was attacked by Kairos ransomware. Kairos is one of the most active ransomware groups, having claimed 107 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Katz Kantor Stonestreet & Buckner ransomware attack occur?

The ransomware attack on Katz Kantor Stonestreet & Buckner was disclosed on March 3, 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 Katz Kantor Stonestreet & Buckner ransomware attack?

The specific data stolen from Katz Kantor Stonestreet & Buckner 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, Katz Kantor Stonestreet & Buckner likely held sensitive business data, client information, and operational records.

How can organisations protect against Kairos attacks?

To defend against Kairos 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.