Ruamjai Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On February 24, 2026, the ransomware group thegentlemen listed Ruamjai on its leak site. The organization operates Ruamjairak Hospital, a 144-bed private facility in Bangkok’s Sukhumvit area. The number of people affected is not stated, and the precise scale or contents of any exfiltrated material remain undisclosed beyond a reference to internal files taken during a ransomware attack. The listing constitutes a claim by the group rather than an independently verified event. No further technical details, such as the date of intrusion or the volume of data involved, have been made public.

What happened

The incident came to light through thegentlemen’s leak-site posting on February 24, 2026. The group asserts that internal files were removed from Ruamjai’s systems during a ransomware operation. No confirmation of the intrusion method, the duration of access, or the quantity of material taken has been released by the hospital or by investigators. The number of individuals whose information may be involved is also unknown.

The group behind it: thegentlemen

Thegentlemen is a ransomware actor that publishes victim names on a dedicated leak site when ransom demands are not met. Public reporting on the group shows a pattern of targeting organizations across multiple countries and sectors, followed by the selective release of stolen material to pressure payment. The listing of Ruamjai follows this established approach, though the group has not published additional files or specific claims about this case beyond the initial announcement.

Ruamjai and its sector

Ruamjai operates Ruamjairak Hospital, a private medical facility established to deliver comprehensive care in Bangkok. The hospital maintains specialized centers for fertility services, including a partnership with the GENEA group, as well as dental and neuroscience treatment. Like other private hospitals, it handles patient admissions, diagnostic imaging, laboratory results, and billing records in the course of routine operations.

Healthcare providers store large volumes of personal and clinical information. A breach at such an institution therefore touches data that individuals typically regard as highly sensitive and that is subject to regulatory protections in many jurisdictions.

What data was at risk

The only detail released is that internal files were allegedly exfiltrated. The exact categories of information contained in those files have not been disclosed. Organizations of this type routinely hold patient identifiers, medical histories, treatment records, insurance details, and administrative correspondence. Without a published inventory, it is not possible to confirm which of these categories, if any, were accessed.

What's at stake

Medical and administrative records can be used for identity-related fraud or to support targeted scams. For patients, exposure of clinical information may affect privacy and, in some cases, future insurability or employment. For the hospital, the incident adds operational costs for investigation, potential regulatory scrutiny, and the need to notify affected individuals once the scope is clarified.

If your data was in this claimed breach

Monitor bank and insurance statements for unusual activity and consider placing fraud alerts with credit agencies. Change passwords for any patient portals or accounts linked to the hospital and enable multi-factor authentication where available. Individuals can also run a free exposure scan of their email address against known breach data to determine whether their information has appeared in other incidents.

AICompiled with AI assistance from public sources and published under our editorial standards.