King City Lumber listed on dragonforce ransomware leak site

• Ransomware group: dragonforce
• Country: United States
• Sector: Manufacturing
• Announcement date: December 5, 2025

King City Lumber targeted by dragonforce ransomware group

The manufacturing firm King City Lumber has been listed on the leak site of the ransomware group known as dragonforce. According to the announcement made on December 5, 2025, the threat actors claim to have compromised the company and are threatening to release stolen information publicly.

Details of the alleged attack

The threat actor known as dragonforce has officially listed King City Lumber on its dedicated leak site. The group alleges that it has successfully compromised the company's data and has issued threats to release this information to the public. The incident is cited as having occurred on December 5, 2025.

The group's announcement includes general information regarding the company's operations. While the group claims to have gained access to the organization's systems, they have not provided specific details regarding the exact nature or content of the leaked data, though they claim a significant volume of information has been taken.

Claimed data and volume

The dragonforce group claims to be in possession of a substantial amount of data belonging to King City Lumber. While the specific categories of the files have not been disclosed by the attackers, the group has specified the following regarding the volume of the alleged theft:

• Claimed data size: 40.12 GB

No specific details regarding the content of the leaked data have been provided, and the listing names no specific data types.

About King City Lumber

King City Lumber is a company that has been providing quality lumber, building materials, and custom metal structures in the Midwest for over 50 years. They offer customized solutions for commercial, residential, agricultural, and storage needs, ranging from garages to horse barns.

Potential risks and industry implications

This alleged leak may pose potential risks to the company's commercial operations and customer data. Given that the company is based in the United States, legal processes under relevant state laws and federal data protection standards may be triggered as a result of the incident. The group's operational model, which involves providing infrastructure to various affiliates, suggests that the attack may have been carried out by different actors working under their umbrella.

The use of the double extortion method—where attackers both encrypt data and threaten to leak it—can negatively impact a company's operational continuity and reputation. For an organization in the manufacturing and building materials sector, such an event can lead to significant disruptions. Furthermore, secondary risks such as identity theft or targeted phishing attacks may be observed for the company's customers and employees if sensitive information is indeed released.

In general, when organizations face such threats, they often look toward defensive measures such as robust backup strategies, multi-factor authentication, and continuous monitoring of their networks. The threat of public data exposure remains a primary driver for modern ransomware groups, forcing companies to navigate complex legal and operational landscapes following a breach.