Sun Fiber listed on sinobi ransomware leak site
US-based manufacturing company Sun Fiber has been listed on the leak site of the threat actor known as sinobi. The announcement claims that 750 GB of data has been compromised.
- Published
- 2 min read
- 2 min read
- Ransomware group: sinobi
- Country: United States
- Sector: Manufacturing
- Announcement date: October 8, 2025
Sun Fiber targeted by sinobi ransomware group
The US-based manufacturing company Sun Fiber has been listed on the leak site of a threat actor known as sinobi. According to the announcement posted on October 8, 2025, the threat actor claims to have compromised a massive dataset totaling 750 GB. This development marks a significant incident for the organization, as the group alleges that the company's operational data has been encrypted during the attack.
Claims made by the sinobi group
The sinobi group has published data they claim belongs to Sun Fiber on their dedicated leak platform. The threat actor alleges to have successfully compromised a 750 GB dataset. In addition to the claims of data theft, the group asserts that the organization's operational data has been encrypted, a common tactic in modern ransomware campaigns. This combination of data exfiltration and encryption suggests a multifaceted attack aimed at maximizing pressure on the target.
The announcement was officially posted on October 8, 2025, coinciding with the claimed date of the attack. While the group has released this information on their platform, the specific details regarding the method of entry or the exact timing of the initial breach remain undisclosed in the public announcement.
Data allegedly involved in the breach
According to the information provided in the announcement, the leaked data includes a variety of sensitive and confidential documents. The threat actor claims that the stolen information consists of the following categories:
- Financial data
- Contracts
- Human resources (HR) records
The presence of such diverse data types suggests a deep penetration into the organization's internal systems and file servers.
About Sun Fiber
Sun Fiber LLC is a manufacturer and supplier of recycled polyester staple fiber (Re-PSF) primarily serving the home textile and furniture industries. Established in 1999, the company is known for its sustainable production practices and customer-oriented technical support services.
Implications and potential risks
This incident suggests that the personal data of Sun Fiber employees and business partners may be at risk of exposure. As a US-based organization, the breach may lead to legal consequences under state-level data protection laws and relevant regulations. The exposure of financial and contractual data could undermine supply chain security and facilitate targeted phishing attacks against third parties.
Information regarding the sinobi group is limited; however, their methods suggest they may be employing a double extortion strategy. Double extortion is a tactic where threat actors not only encrypt an organization's data to disrupt operations but also steal sensitive information to threaten the victim with public disclosure unless a ransom is paid. This approach increases the pressure on organizations, as they face both operational downtime and the threat of reputational damage and regulatory scrutiny.
The leak of this data could result in significant reputational damage and operational disruptions for the organization. For companies in the manufacturing sector, such breaches can disrupt the flow of materials and information throughout the supply chain. To mitigate such risks, organizations typically focus on robust backup strategies, network segmentation, and continuous monitoring of their digital environments to detect unauthorized access early.