A recent ransomware attack has disrupted healthcare services and exposed sensitive patient data at the MACT Health Board, which operates clinics serving American Indian communities in California’s Sierra Foothills. The cybercriminal group Rhysida has claimed responsibility for the November 2025 breach and has listed MACT on its data leak site, demanding a ransom of eight bitcoin, valued at about 662,000 dollars at the time. Although MACT has notified affected patients, the organization has not confirmed Rhysida’s claims or disclosed how many individuals were impacted.
According to MACT’s notice to victims, an unauthorized party accessed some files on its systems between November 12 and November 20, 2025, leading to serious exposure of personal and medical information. Compromised data includes names, Social Security numbers, and detailed medical information such as diagnoses, doctors, insurance details, medications, test results, images, and records of care and treatment. In response, MACT is offering eligible victims free identity monitoring, recognizing the heightened risk of identity theft and fraud.
The attack caused significant operational disruption across MACT’s clinics starting November 20, 2025, affecting phone services, prescription ordering, and appointmen
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