Mayco International listed on Anubis ransomware leak site

• Ransomware group: Anubis
• Country: United States
• Sector: Manufacturing
• Announcement date: November 3, 2025

Automotive component manufacturer Mayco International has been listed on the leak site of the Anubis ransomware group. The threat actor claims to have exfiltrated a significant volume of data from the organization, marking a potential major security incident for the US-based manufacturer.

The claimed attack and data theft

The Anubis group has published over 1TB of data that they claim belongs to Mayco International. According to the announcement made on November 3, 2025, the threat actor alleges that the stolen information includes manufacturing processes, technical blueprints, and correspondence with business partners. The group has listed the data, claiming it contains proprietary information and trade secrets belonging to the company.

In modern cyberattack scenarios, ransomware groups often employ a tactic known as double extortion. In this method, attackers do not just encrypt a victim's files to disrupt operations; they also steal sensitive data before the encryption occurs. The threat actors then use the threat of leaking this information on public or private leak sites to pressure the organization into paying a ransom. If the ransom is not met, the stolen data is released to the public, causing reputational and operational damage.

Details of the allegedly leaked content

Based on the information provided by the threat actor, the leaked content is quite diverse, spanning technical, operational, and administrative domains. Screenshots provided by the group show various file types and documents that suggest a deep penetration into the company's internal systems. Specifically, the files include 3D model files with .prt and .mfr extensions, which are common in engineering and manufacturing environments.

The data allegedly compromised includes the following items:

• 3D technical blueprints
• Production process reports
• Business correspondence
• Partner data

The presence of technical drawings and production-related images suggests that the breach may have reached into the core intellectual property of the organization's manufacturing workflows.

Organization profile

Mayco International is an automotive supplier that designs and manufactures interior and exterior plastic components, modules, and systems for the automotive industry. The company specializes in injection molding and assembly processes.

Impact assessment and industry implications

The nature of the allegedly leaked data could negatively impact the competitive advantage of Mayco International within the automotive sector. The exposure of intellectual property, such as technical blueprints and manufacturing processes, poses a significant risk to the company's market position. Furthermore, the exposure of such information may lead to legal issues regarding existing contracts with business partners and could jeopardize overall supply chain security.

As a US-based entity, the company may face data breach notification obligations under relevant state laws and federal regulations. The specific details regarding the ransom demand were not provided in the announcement, and the scope of the data could create long-term impacts on corporate reputation. While public information regarding the Anubis group is limited, such leaks may facilitate targeted phishing attacks against the company's clients and partners, as attackers can use stolen correspondence to craft highly convincing social engineering campaigns.

For organizations operating in the manufacturing and automotive sectors, such incidents highlight the necessity of robust cybersecurity frameworks. Common defensive steps for organizations include implementing strict access controls to protect intellectual property, maintaining offline backups to mitigate the impact of encryption, and conducting regular security awareness training to defend against phishing. Additionally, monitoring for unauthorized data exfiltration and ensuring that third-party partner connections are secured are critical components of a modern defense-in-depth strategy.