Slimsoft listed on Space Bears ransomware leak site

• Ransomware group: Space Bears
• Country: Israel
• Sector: Technology
• Announcement date: December 5, 2025

Space Bears claims data leak at Slimsoft

The threat actor known as Space Bears has listed the company Slimsoft on its leak site, claiming to have exfiltrated sensitive information. According to the announcement made on December 5, 2025, the group alleges that they obtained company data during a cyber incident that occurred on December 4, 2025. This claim marks a significant development for the targeted organization, as the group's announcement focuses on a data leak rather than a traditional encryption-based ransomware attack.

Ransomware leak sites are platforms used by cybercriminal groups to pressure victims into paying ransoms by threatening to release stolen information. In many modern cyberattacks, threat actors employ a tactic known as double extortion. This involves not only encrypting an organization's systems to disrupt operations but also stealing sensitive data to use as leverage. By threatening to publish this data publicly, attackers increase the pressure on the victim to comply with ransom demands to avoid reputational damage or regulatory scrutiny.

Details of the claimed incident

The announcement from Space Bears alleges that the breach involved the theft of data related to the company's core business operations. Specifically, the group claims to have accessed information pertaining to the organization's software and web development activities. While the specific volume of the data and the exact number of files have not been disclosed by the group, the threat actor has identified the specific types of information they claim to have obtained.

The data allegedly included in the leak consists of the following:

• SQL database files
• Other unidentified file types

The group has not provided information regarding the total size of the data cache or the specific number of files involved in the breach. Furthermore, there has been no mention of a specific ransom demand or any other details regarding the group's requirements for the return of the data.

About Slimsoft

Slimsoft is an Israel-based technology company with over 25 years of experience. The organization specializes in providing custom software and website development services that are tailored to meet the specific needs of its customers. Given its long-standing presence in the technology sector, the company maintains a diverse client base requiring specialized digital solutions.

Risk assessment and implications

This leak claim may bring about the risk of exposing sensitive data or source code belonging to the company's clients. Because Slimsoft provides custom software and web development, the exposure of such data could potentially lead to risks involving identity theft or supply chain attacks. In a supply chain attack, an attacker targets a service provider to gain access to the systems or data of the provider's customers, potentially creating a domino effect across multiple organizations.

Furthermore, as the company is based in Israel, a potential data breach could trigger legal processes under local data protection regulations. Organizations operating in the technology sector often face significant legal and regulatory obligations to protect client data and report breaches to the relevant authorities.

The fact that the Space Bears group focuses on data exfiltration and extortion rather than traditional encryption suggests that the company may face double extortion risks. To defend against such threats, organizations in the technology sector often implement various defensive measures. These include robust data encryption for data at rest and in transit, strict access controls to limit the exposure of sensitive databases, and continuous monitoring of network traffic to detect unusual data exfiltration patterns. Additionally, maintaining regular, offline backups and conducting thorough incident response drills are common practices to mitigate the impact of such attacks.

Information regarding the Space Bears group remains limited, making it difficult to establish a comprehensive profile of their specific tactics, techniques, and procedures beyond their focus on data exfiltration and extortion.