Mausolff Immobilien listed on dragonforce ransomware leak site

• Ransomware group: dragonforce
• Country: Germany
• Sector: Professional Services
• Announcement date: July 15, 2025

Mausolff Immobilien targeted by dragonforce ransomware group

Mausolff Immobilien has been listed on the leak site of the ransomware group known as dragonforce. The group has published an announcement claiming that the German-based organization has been compromised, alleging that they have successfully gained access to the institution's internal systems and exfiltrated data.

Details of the alleged attack

The announcement regarding the alleged breach was made by the dragonforce group on July 15, 2025. According to the claim made via the group's dedicated leak site, the attackers have successfully breached the perimeter of Mausolff Immobilien. This type of activity is common in modern ransomware operations, where threat actors often employ a double extortion tactic. In such scenarios, attackers not only encrypt an organization's data to disrupt operations but also steal sensitive information to use as leverage for extortion, threatening to publish the stolen data on public leak sites if a ransom is not paid.

The group's claim suggests that the breach was successful enough to allow for the removal of information from the victim's environment. While the announcement was made on July 15, 2025, the group has also identified this as the date of the claimed attack.

Information regarding the leaked data

At this time, no information has been provided regarding the nature of the alleged leaked data. Furthermore, there is no screenshot available to verify the contents of the breach or the specific files that may have been targeted by the attackers. The listing does not specify the volume of data or the specific file counts involved in the incident.

About Mausolff Immobilien

Mausolff Immobilien is a real estate agency based in Moers, Germany. With over 35 years of experience, the company provides services for selling and renting residential properties. As a professional services firm operating within the German market, the organization handles various aspects of residential real estate transactions.

Risk assessment and industry implications

The alleged incident may pose personal data security risks for the institution's clients and employees. Because the organization operates in Germany, a potential data breach could lead to legal consequences under the European Union's General Data Protection Regulation (GDPR). Organizations operating within the European Union must adhere to strict protocols regarding the protection of personal information, and failures in data security can result in significant regulatory scrutiny and legal liabilities.

If the data is published, it may negatively impact the institution's reputation and expose clients to targeted phishing attacks. When sensitive client information is leaked, attackers often use it to craft highly convincing social engineering campaigns, making it more likely that individuals will fall victim to fraudulent communications.

Public information regarding the dragonforce group is limited. It is reported that the group adopts a model of providing branding and infrastructure to affiliates. This operational structure suggests that the attack could have been carried out by different actors using the dragonforce framework. In such a model, the core group provides the technical tools and the platform, while various affiliates carry out the actual intrusion and data theft.

For organizations in the professional services and real estate sectors, maintaining robust cybersecurity defenses is essential to mitigate these risks. Common defensive steps include implementing multi-factor authentication, maintaining regular offline backups, and conducting regular security awareness training for employees to recognize phishing attempts. Continuous monitoring of network traffic and implementing strict access controls can also help prevent unauthorized access to sensitive client and corporate data.