Nova ransomware group lists ​​​​Bio-Clima Service on its leak site

• Ransomware group: Nova
• Country: Italy
• Sector: Professional Services
• Announcement date: April 28, 2025

Nova ransomware group claims data breach at Bio-Clima Service

The threat actor known as Nova has published an announcement on a leak site claiming to have leaked data belonging to Bio-Clima Service. According to the group's post, the breach involves a significant volume of information, which the attackers claim to have made available for download.

Details of the alleged attack

The Nova group has created a specific leak announcement claiming to have targeted Bio-Clima Service. According to the claims made by the group, the organization's systems were encrypted on April 16, 2025. Following the encryption of the systems, the group asserts that the data was subsequently leaked on April 24, 2025. The announcement was officially posted to the leak site on April 28, 2025.

The group claims to have published the institution's data and has provided a download link to facilitate access to the alleged stolen information. This pattern of behavior is consistent with modern ransomware tactics, often referred to as double extortion. In these scenarios, attackers do not merely encrypt a victim's files to disrupt operations; they also exfiltrate sensitive data to use as leverage, threatening to release it publicly if demands are not met. This approach increases the pressure on the victim by introducing the risk of regulatory scrutiny and reputational damage.

Data involved in the claim

Regarding the specific content of the breach, there are no specific details regarding the nature of the allegedly leaked data. The information provided by the group is limited to the scale of the theft. The following details were provided in the announcement:

• Total claimed data size of 30 GB

The listing does not provide a specific file count or details regarding the specific types of files or categories of information contained within the 30 GB of data.

About Bio-Clima Service

Bio-Clima Service is an Italy-based company that specializes in the installation, maintenance, and technical service of heating, ventilation, and air conditioning (HVAC) systems. As a provider in the professional services sector, the company manages technical infrastructure and essential services for its clients.

Impact and security implications

This incident suggests that the organization's operational continuity may have been disrupted and sensitive data may have been exposed. Because the organization is based in Italy, the breach may lead to legal sanctions and compliance processes under the EU General Data Protection Regulation (GDPR). Such regulatory frameworks impose strict requirements on how organizations must protect personal data and how they must respond when a breach occurs.

Furthermore, secondary risks may arise for the organization's employees and customers, such as identity theft or targeted phishing attacks. When sensitive information is leaked, attackers often use it to craft highly convincing social engineering campaigns designed to exploit the trust of the victims.

Public information about the Nova group is limited; however, it is observed that the group employs both encryption and data exfiltration methods. This dual-threat approach makes recovery difficult, as the organization must deal with both the loss of system access and the loss of data confidentiality simultaneously.

In response to such threats, organizations in the professional services sector may need to review their data security measures and notify the affected parties. General defensive steps for organizations facing these types of threats include implementing robust backup solutions, enforcing multi-factor authentication, and maintaining strict network segmentation to prevent lateral movement by attackers. Continuous monitoring and a well-tested incident response plan are also essential components of a modern cybersecurity posture.