Adept listed on sinobi ransomware leak site

• Ransomware group: sinobi
• Country: Denmark
• Sector: Professional Services
• Announcement date: November 24, 2025

Adept targeted by sinobi ransomware group

The Danish-based professional services firm Adept has been listed on the leak site of the ransomware group known as sinobi. According to the announcement made on November 24, 2025, the threat actor claims to have successfully targeted the organization, marking a significant incident for the firm.

Ransomware attacks often follow a pattern of double extortion, where attackers not only encrypt an organization's internal systems to disrupt operations but also threaten to leak sensitive information on public forums if a ransom is not paid. This tactic is designed to maximize pressure on the victim by leveraging the threat of public exposure and regulatory scrutiny.

The claims made by sinobi

The threat actor identified as sinobi has published a ransom notice specifically targeting Adept. In this announcement, the group claims that the organization's data has been encrypted, a move that typically aims to paralyze the victim's ability to conduct business. The group has asserted that the attack took place around November 22, 2025.

As part of their extortion attempt, the threat actor is demanding a ransom payment of $5,500,000 in exchange for the release of the encrypted data. Such high-value demands are characteristic of modern ransomware operations that target specialized firms with critical business processes. While the group has made these claims, the incident remains a claim by the threat actor.

Data involvement and specifics

Regarding the specific nature of the information involved in this incident, the provided records do not offer detailed information. There is no information provided regarding the specific nature of the data claimed to be leaked or encrypted in the available documentation.

The listing names no specific data types that have been compromised or targeted during the claimed attack.

About Adept

Adept is a Danish architectural firm that specializes in urban development and architectural design. The organization focuses on the creation of sustainable living spaces and is known for developing functional and community-oriented projects for both municipalities and private developers.

Potential impact and industry implications

This incident may lead to operational disruptions and reputational damage for Adept. The encryption of data could cause a halt in the organization's business processes, preventing the firm from fulfilling its architectural and development obligations. Furthermore, as the firm operates in Denmark, a potential data breach may trigger legal obligations under the General Data Protection Regulation (GDPR) within the European Union.

Secondary risks associated with such incidents include the potential use of leaked data in identity theft or targeted phishing campaigns. When sensitive organizational or personal data is exposed, attackers often use it to launch more sophisticated social engineering attacks against employees or clients.

For organizations operating in the professional services sector, maintaining robust defensive postures is essential. Common defensive steps include implementing multi-factor authentication, maintaining offline backups of critical data, and conducting regular security awareness training to help employees recognize phishing attempts. Additionally, maintaining a clear incident response plan can help mitigate the operational and legal consequences of a successful ransomware deployment.

Summary of the incident

• Organization: Adept
• Ransomware group: sinobi
• Claimed attack date: 2025-11-22
• Ransom demand: $5,500,000
• Announcement date: November 24, 2025