L S GRIM listed on sinobi ransomware leak site

• Ransomware group: sinobi
• Country: United States
• Announcement date: December 18, 2025

The engineering firm L S GRIM has been listed on the leak site of the ransomware group known as sinobi. The announcement, which appeared on December 18, 2025, indicates that the group claims to have successfully targeted the organization.

Details of the claimed attack

According to the listing posted by sinobi, the group claims to have encrypted the data belonging to L S GRIM. The attack was reportedly carried out on December 18, 2025. In the announcement, the threat actors have stated a ransom demand of 1,500,000 USD to resolve the incident.

Ransomware attacks of this nature often involve a tactic known as double extortion. In these scenarios, attackers not only encrypt an organization's files to disrupt operations but also threaten to leak sensitive information on public leak sites if the ransom is not met. This pressure is designed to force organizations into compliance by leveraging the threat of reputational damage and regulatory scrutiny.

Data involved in the incident

The listing indicates that the organization's data has been encrypted. However, the group has not provided any specific details or file lists regarding the nature of the compromised data. The announcement does not specify the volume of data taken or the exact number of files involved.

• No specific data types or file lists were provided in the listing.

About L S GRIM

L.S. Grim Consulting Engineers is an engineering firm providing mechanical, electrical, and plumbing design and consulting services. The company specializes in fire protection systems, project management, and solutions aimed at LEED certification.

Potential impact and organizational risks

This incident may lead to disruptions in the organization's operational processes and damage its business continuity. As a US-based entity, a potential data breach could trigger state-level data breach notification laws and relevant sectoral regulations. The risks to the organization's engineering projects and client data may result in secondary consequences such as the exposure of trade secrets or loss of intellectual property.

Should the ransom remain unpaid, the public release of data could lead to reputational damage and the inability to fulfill contractual obligations with clients. In many cases, organizations facing such threats focus on defensive measures such as maintaining offline backups, implementing multi-factor authentication, and conducting regular security audits to mitigate the impact of such incidents.

Public information regarding the sinobi group remains limited, making it difficult to determine their specific tactics, techniques, or procedures. For organizations in the engineering and consulting sector, maintaining rigorous data protection standards is essential to safeguard proprietary designs and client-specific project information.