St. Joseph's Healthcare Hamilton Listed by rhysida Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
St. Joseph's Healthcare Hamilton was listed by the Rhysida ransomware group on November 22, 2025, with internal files reported as exfiltrated. Individuals connected to the organization should review any official notices and monitor their personal information for signs of misuse.
What happened
The listing states that internal files were exfiltrated during a ransomware attack. No further public information has been released on when the intrusion occurred, how access was obtained, or how much data may have been taken. The scale of the incident and the number of people affected remain undisclosed.
Inside rhysida
Rhysida is a ransomware group that has conducted operations against organizations in several countries and sectors. Its typical approach involves both encrypting systems and copying data, then using a leak site to pressure victims by threatening to publish the stolen material. The group’s listing of St. Joseph's Healthcare Hamilton constitutes a claim by Rhysida; independent confirmation of the data’s contents or the circumstances of the theft has not been made public.
About St. Joseph's Healthcare Hamilton
St. Joseph's Healthcare Hamilton provides hospital and specialty care services in Ontario. Healthcare organizations routinely collect and store large volumes of personal and clinical information to support patient treatment, billing, and regulatory requirements. Incidents affecting such entities can interrupt clinical workflows and place personal health details at risk of further distribution.
The information in question
The listing refers only to internal files that were allegedly exfiltrated. The exact categories of data are not specified. While hospitals commonly hold patient records, staff details, and administrative documents, it is not confirmed whether any of these types were among the material referenced in the claim.
What's at stake
Individuals whose records may be involved face the possibility that personal or medical information could be used for identity-related fraud or other unauthorized purposes. The organization may incur costs related to investigation, system restoration, and regulatory reporting, though the full operational impact has not been detailed publicly.
If your data was in this claimed breach
Anyone concerned about possible exposure should review account statements and credit reports for unusual activity and consider requesting a fraud alert or credit freeze with major bureaus. Running a free exposure scan of an email address against known breach data can provide an initial indication of whether the address has appeared in previously published records.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
More recent breaches
Mediprobe Research Listed by rhysida Ransomware GroupSenior Support Services Listed by rhysida Ransomware GroupSinging River Health System Listed by rhysida Ransomware GroupHarbour Town Doctors Listed by rhysida Ransomware GroupLatest breaches
Publicly posted by rhysida — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.