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Cyber Threat
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Ransomware victim Construction

ellison-mills.com

Listed by Chaos on · organisation based in United States

ellison-mills.com

Disclosed
Sep 1, 2025
Leak-site listing date
Threat group
Chaos
105 victims listed
Country
United States
#1 most targeted
Sector
Construction

ThreatAI analysis

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

About the Chaos group

Chaos is a ransomware-as-a-service operation that emerged in early 2025, likely formed by former BlackSuit/Royal members, offering cross-platform ransomware for Windows, Linux, ESXi, and NAS to affiliates recruited on the RAMP dark web forum, excluding CIS/BRICS countries and hospitals from targeting. Chaos has listed 95 victims since February 2025.

Incident analysis

ellison-mills.com was listed by Chaos ransomware, a group with 105 victims recorded in this database. The listing appeared on the group's leak site on September 1, 2025.

ellison-mills.com is based in United States and operates in the Construction sector. United States ranks #1 worldwide for ransomware disclosures, with 10,141 victims in this database.

Sector context. Construction firms often hold sensitive project data, client financials, and intellectual property. The industry's typically lean IT security teams can make them more vulnerable.

Chaos 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 ellison-mills.com attacked by ransomware?

Yes. ellison-mills.com was listed as a victim of the Chaos ransomware group on September 1, 2025. The organisation is based in United States and operates in the Construction sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked ellison-mills.com?

ellison-mills.com was attacked by Chaos ransomware. Chaos is one of the most active ransomware groups, having claimed 105 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the ellison-mills.com ransomware attack occur?

The ransomware attack on ellison-mills.com was disclosed on September 1, 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 ellison-mills.com ransomware attack?

The specific data stolen from ellison-mills.com 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 Construction organisation, ellison-mills.com likely held sensitive business data, client information, and operational records.

How can organisations protect against Chaos attacks?

To defend against Chaos 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.