Decoline listed on sarcoma ransomware leak site

• Ransomware group: sarcoma
• Country: Belgium
• Sector: Professional Services
• Announcement date: May 4, 2025

Decoline listed on sarcoma ransomware leak site

Decoline, a professional services firm based in Belgium, has been listed on the leak site associated with the ransomware group known as sarcoma. The announcement, which appeared on May 4, 2025, indicates a targeted cyberattack aimed at the organization.

Details of the alleged attack

According to the announcement published by the sarcoma group, the organization's network was compromised, resulting in the exfiltration of data. The group claims that the attack occurred on May 4, 2025, the same day the leak was announced. While the group has made these claims publicly, information regarding the specific tactics, techniques, and procedures used by the sarcoma group remains limited in the public domain.

Ransomware attacks often follow a pattern of double extortion, where threat actors not only encrypt an organization's systems to disrupt operations but also steal sensitive information to use as leverage. By threatening to release stolen data on a public leak site, attackers aim to pressure the victim into paying a ransom to prevent the exposure of proprietary or personal information. This method increases the pressure on organizations, as a leak can lead to significant reputational damage and legal consequences.

Data involved in the claim

The sarcoma group alleges that they have obtained a significant amount of information from the organization's network. Specifically, the group claims to possess an archive containing 85 GB of data. Despite the substantial size of the claimed archive, the announcement does not provide specific details regarding the content of the leaked files. No screenshots were provided by the group to verify the nature of the data, and no specific file counts or ransom demands have been disclosed in the public announcement.

The listing names no specific data types that have been compromised. Without further clarification from the attackers or a forensic investigation by the victim, the exact nature of the 85 GB archive remains unknown.

Organization profile

Decoline is a Belgian company that has been active since 1990. Headquartered in Pelt, the company is a leading player in the market for professional window decoration solutions. They specialize in the production and distribution of high-quality curtain-hanging systems and various professional window decoration products, maintaining high quality standards and innovation in their sector.

Potential impact and organizational risks

This alleged data breach may pose significant risks to Decoline's operational processes and commercial reputation. When an organization's data is exfiltrated, it can disrupt day-to-day business functions and erode the trust established with clients and partners over decades. Until the contents of the 85 GB archive are clarified, the possibility that personal data belonging to employees or customers has been exposed cannot be ignored.

Because the organization is based in Belgium, any confirmed breach involving personal information may trigger legal obligations and administrative sanctions under the European Union's General Data Protection Regulation (GDPR). Organizations operating within the EU must adhere to strict protocols regarding data protection and must often notify regulatory bodies and affected individuals if a breach is detected.

Furthermore, there is a persistent risk that leaked data could be utilized by malicious actors for identity theft or targeted phishing attacks against the organization's stakeholders. To mitigate such risks, organizations in the professional services sector often find it necessary to notify affected parties and implement enhanced security measures. Common defensive steps include strengthening network monitoring, implementing multi-factor authentication, and conducting regular security awareness training to defend against the evolving landscape of ransomware threats.