Sai Mai Hospital listed on Qilin ransomware leak site

• Ransomware group: Qilin
• Country: Thailand
• Sector: Healthcare
• Announcement date: November 6, 2025

The Qilin ransomware group has officially listed Sai Mai Hospital on its dedicated leak site. According to the announcement published on November 6, 2025, the threat actor claims to have successfully infiltrated the systems of the Thailand-based healthcare institution and exfiltrated data belonging to the organization.

The claimed attack and event details

The threat actor known as Qilin has issued a public announcement regarding its targeting of Sai Mai Hospital. By listing the organization on its leak site, the group has signaled a potential breach of the institution's digital infrastructure. The announcement was made on November 6, 2025, a date that aligns with the group's claimed attack date, suggesting that the incident may have an immediate impact on the institution's operational processes.

Ransomware groups often use leak sites as a tool for public pressure. These sites serve as a platform where attackers post information about their victims to coerce them into paying ransoms. In many cases, these groups employ a tactic known as double extortion. In a double extortion scenario, the attackers do not just encrypt the victim's data to disrupt operations; they also steal sensitive information before the encryption occurs. This allows them to threaten the public release of the stolen data if the ransom is not paid, significantly increasing the pressure on the victimized organization.

Data involved in the claim

Regarding the specifics of the alleged breach, the information provided by the threat actor remains limited. The listing does not provide details concerning the specific nature or the exact scope of the allegedly exfiltrated data. Furthermore, the provided records and screenshots do not contain information regarding the total size of the data or the specific file count involved in the incident. The listing names no specific data types.

Organization profile

Sai Mai Hospital is a private hospital located in Bangkok, Thailand. It is a healthcare institution specializing in general medical services, emergency care, and various medical specialties.

Risk assessment and sector implications

This claim against Sai Mai Hospital may pose a risk to the security of sensitive data within the healthcare sector. Given the Qilin group's known use of double-extortion tactics, the potential exposure of patient records or corporate data could lead to secondary risks for individuals, such as identity theft and fraud. The targeting of healthcare organizations is a notable trend, as these entities often handle highly sensitive and regulated information.

Under Thailand's data protection regulations, the institution may be required to fulfill specific data breach notification obligations to both regulators and affected individuals. Beyond the regulatory implications, any disruption to healthcare services caused by such an attack could have negative implications for patient safety, as medical institutions rely heavily on continuous access to digital records and systems for care delivery.

To defend against such threats, organizations in the healthcare sector typically focus on robust security frameworks. This includes implementing strict access controls, maintaining comprehensive backups, and ensuring continuous monitoring of network traffic to detect unauthorized exfiltration. Because healthcare providers are frequent targets for ransomware groups, maintaining a high state of readiness regarding data protection and incident response is essential for mitigating the impact of potential breaches.