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California School Employees Association

Ransomware attack by Ransomhouse · Disclosed September 10, 2026 · 🇺🇸 United States

www.csea.com

Date Disclosed
Sep 10, 2026
2026
Threat Group
Ransomhouse
148 total victims
Country
🇺🇸 United States
Industry
Education

ThreatAI Analysis

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

Ransomhouse dark web leak site listed California School Employees Association on 10 September 2026, offering its members protected by CSEA for financial services and legal support.

About California School Employees Association

The California School Employees Association (CSEA) is dedicated to supporting classified school employees and advocating for public education. They offer a range of member benefits including financial services, legal help, and educational resources. CSEA aims to protect the rights of its members while promoting quality education for students. Their intended clients include school employees, retirees, and individuals interested in joining their advocacy efforts.

Source record: ransomware.live

About the Ransomhouse group

RansomHouse is a double-extortion RaaS operation active since late 2021, attributed to the threat actor "Jolly Scorpius," targeting over 120 organizations across healthcare, finance, transportation, and government, recently upgrading to a multi-layered dual-key encryption architecture. Ransomhouse has listed 206 victims since June 2021.

Incident Analysis

California School Employees Association was targeted by Ransomhouse ransomware, one of the most active ransomware groups in our database with 148 confirmed victims globally. The attack was disclosed on September 10, 2026, when California School Employees Association appeared on the group's dark web leak site.

California School Employees Association is based in United States , operating in the Education sector. United States ranks #1 globally for ransomware attacks, with 9,509 victims in our database.

Sector context: Educational institutions often have under-resourced IT security teams and hold large amounts of student and faculty personal data, making them attractive targets for ransomware groups.

Ransomhouse 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 — 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: Sep 16, 2026 10:00 UTC.

Frequently Asked Questions

Was California School Employees Association attacked by ransomware?

Yes. California School Employees Association was listed as a victim of the Ransomhouse ransomware group on September 10, 2026. The organisation is based in United States and operates in the Education sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked California School Employees Association?

California School Employees Association was attacked by Ransomhouse ransomware. Ransomhouse is one of the most active ransomware groups, having claimed 148 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the California School Employees Association ransomware attack occur?

The ransomware attack on California School Employees Association was disclosed on September 10, 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 California School Employees Association ransomware attack?

The specific data stolen from California School Employees Association 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 Education organisation, California School Employees Association likely held student and faculty personal data and academic records.

How can organisations protect against Ransomhouse attacks?

To defend against Ransomhouse 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.