CCJM listed on sinobi ransomware leak site

• Ransomware group: sinobi
• Country: United States
• Announcement date: December 3, 2025

Engineering firm CCJM targeted by sinobi ransomware group

The engineering firm CCJM has been listed on the leak site associated with the ransomware group known as sinobi. The threat actor announced the incident on December 3, 2025, claiming that the organization's systems have been encrypted during the attack.

Details of the claimed attack and ransom demand

According to the announcement made by the sinobi group, the firm's internal systems have been compromised and encrypted. The threat actor has issued a ransom demand in connection with this incident, stating that a payment of 16,100,000 dollars is required. While the group has provided visual evidence in the form of screenshots suggesting that systems have been encrypted, the specific nature of the data involved remains unclear.

Ransomware attacks often involve a tactic known as double extortion. In these scenarios, threat actors not only encrypt an organization's data to disrupt operations but also steal sensitive information to use as leverage. By threatening to leak stolen data on public leak sites, attackers aim to pressure the victim into paying the ransom to prevent reputational damage or regulatory scrutiny. The use of a leak site serves as a public pressure mechanism to increase the likelihood of a successful extortion attempt.

Data and impact assessment

Regarding the specific information compromised during this incident, the listing names no specific data types or quantities of files. There are no details available regarding the exact volume of data or the specific categories of information that may have been targeted or exfiltrated by the sinobi group.

The lack of specific information regarding the leaked or threatened data is a common occurrence in the early stages of a leak site announcement. However, the visual evidence provided by the attackers suggests a significant disruption to the organization's digital environment. When systems are encrypted, the immediate consequence is often a loss of access to critical files and operational tools, which can halt business activities entirely.

About CCJM

CCJM is a multi-disciplinary engineering firm that has been providing engineering solutions in areas such as buildings, infrastructure, energy, transportation, and water management since 1979. The firm provides construction management, inspection, and smart technology services for both public and private sector projects.

Potential implications and organizational risks

This incident may indicate that CCJM's operational continuity has been disrupted. The encryption of systems could restrict the firm's access to essential engineering projects and vital client data. Such a disruption can create negative impacts on the firm's commercial reputation and could lead to difficulties in fulfilling contractual obligations with clients.

Furthermore, if the ransom is not paid, the potential leaking of data could trigger secondary risks, such as identity theft or targeted phishing attacks against the firm or its stakeholders. In these cases, stolen information is used to conduct more sophisticated social engineering campaigns against the organization's contacts.

For organizations operating in high-stakes sectors like engineering and infrastructure, maintaining robust cybersecurity posture is essential. Common defensive steps include implementing multi-factor authentication, maintaining offline backups of critical project data, and conducting regular security awareness training for employees. Additionally, network segmentation can help prevent the lateral movement of ransomware within a corporate environment. Information regarding the sinobi group remains limited in the public domain, making it difficult to assess their specific tactics, techniques, and procedures.