TridentLocker ransomware group lists allenprinting on its leak site

• Ransomware group: TridentLocker
• Country: United States
• Sector: Professional Services
• Announcement date: December 19, 2025

TridentLocker claims data breach at Allen Printing

The ransomware group known as TridentLocker has published an announcement on its leak site claiming to have stolen and leaked a significant amount of data belonging to Allen Printing. According to the group's claim, the breach involves a substantial volume of information, potentially compromising the privacy and operational security of the organization.

Ransomware attacks often follow a pattern of double extortion, where threat actors not only encrypt an organization's systems to disrupt operations but also exfiltrate sensitive data. By threatening to publish this data on a public leak site, attackers aim to exert maximum pressure on the victim to meet ransom demands. In this instance, the group has moved forward with their claim of a data leak involving the Michigan-based company.

Details of the claimed attack

The announcement made by TridentLocker on December 19, 2025, asserts that the group successfully targeted Allen Printing. The group claims to have obtained a dataset consisting of 26,353 files, which they allege were taken directly from the organization's internal systems. The total size of the data claimed to be leaked is 88.28 GB.

The timeline provided by the attackers suggests that the claim of the leak was made on the same day as the alleged attack, December 19, 2025. While the group has published this information on their platform, the specific details regarding the method of entry or the exact nature of the intrusion remain undisclosed by the threat actors.

Data involved in the leak

The file list provided by the group in their leak announcement appears to consist of various archive files. These archives reportedly contain a wide range of information, with file names suggesting the presence of documentation related to various clients and specific projects. While the group has not provided a detailed classification or a granular breakdown of the specific contents within these archives, the naming conventions indicate that the stolen data likely includes:

• Business correspondence
• Project documentation
• Client data

The availability of such a large volume of files poses a significant risk, as the contents may include sensitive information that is vital to the company's daily operations and its relationships with external partners.

About Allen Printing

Allen Printing is a professional services company based in Michigan, United States. The organization specializes in a variety of printing solutions, including commercial printing, digital printing, and graphic design. They provide a wide range of marketing materials and custom printing services designed to meet the needs of businesses operating at various scales.

Potential impact and organizational risks

This alleged leak could lead to the exposure of sensitive business information and critical client data. For an organization like Allen Printing, which handles diverse projects and marketing materials for various businesses, such a breach can have far-reaching consequences. The publication of this data may disrupt the organization's operational processes and create secondary risks for their third-party clients, who may also find their own information compromised through this connection.

Because the organization is based in the United States, this incident may require evaluation in terms of state-level data privacy regulations and potential legal sanctions. Furthermore, the public availability of this data can serve as a foundation for subsequent malicious activities, such as identity theft or highly targeted phishing attacks against the company or its clients. Information regarding the TridentLocker group remains limited, making it difficult to assess their long-term motives or typical operational patterns.

In general, organizations in the professional services sector can mitigate such risks by implementing robust security frameworks. This includes maintaining regular offline backups, enforcing multi-factor authentication across all systems, and conducting regular security awareness training for employees to prevent initial access via phishing. Continuous monitoring of network traffic and implementing strict access controls are also essential defensive steps to protect sensitive client and project documentation from unauthorized exfiltration.