Ransomware Attacks on Healthcare Sector Remain High in 2025, with Shifts in Targets and Tactics In the first nine months of 2025, Comparitech recorded 293 ransomware attacks on hospitals, clinics, and other direct healthcare providers matching 2024’s figures for the same period. However, attacks on healthcare businesses, including pharmaceutical manufacturers, medical billing firms, and tech vendors, surged by 30%, rising from 100 in 2024 to 130 in 2025. Rebecca Moody, Comparitech’s head of data research, attributed the increase in attacks on healthcare businesses to heightened awareness following high-profile breaches in 2024, such as the Ascension attack (5.6 million records breached) and the Synnovis ransomware incident ($50 million ransom demand). While providers have bolstered defenses through updates, employee training, and backups hackers have pivoted to third-party vendors, exploiting shared systems and data-processing networks to access multiple organizations at once. ### Geographic Breakdown The U.S. remained the hardest-hit country, accounting for 257 attacks (63 on providers, 11 on businesses). Australia, Germany, and the U.K. followed, though their totals were significantly lower. For healthcare businesses, the U.S. led with 65 attacks, trailed by Italy (7) and India (6). Australia defied the global trend, seeing a 67% increase in attacks from nine in 2024 to 15 in 2025 with healthcare providers bearing the brunt (an 83% rise). ### Ransomware Strains and Impact - Healthcare Providers (293 attacks, 94 confirmed): - Top strains: INC (39 attacks), Qilin (34), SafePay (21), RansomHub (13), Medusa (13). - Confirmed breaches: 7.4 million records exposed, average ransom demand of $514,000. - Largest breaches by records: Interlock (2.7M+ from DaVita), Nova (941K+ from Clinical Diagnostics), BianLian (multiple U.S. providers). - Healthcare Businesses (130 attacks, 23 confirmed): - Top strains: Qilin (19 attacks), KillSec (12), Akira (10), INC (9), SafePay (7). - Confirmed breaches: 6 million records exposed, average ransom demand of $532,000. - Largest breaches by data volume: Qilin (11.1TB stolen, including 8TB from Israel’s Shamir Medical Center), INC (20.1TB claimed, unconfirmed). Notably, Van Helsing caused the largest single breach by records, affecting 320,000 individuals in an attack on Australia’s Compumedics Limited. KillSec followed with 241,000 records compromised via Ireland’s Ocuco Limited. ### Broader Trends While global ransomware attacks rose 36% year-over-year in 2025, healthcare saw a 2% decline though this masks the shift toward supply-chain attacks targeting vendors. The education sector, by contrast, saw only a 5% increase, highlighting healthcare’s persistent vulnerability.

Optical Software Solution Provider Ocuco Inc., based in Dublin, Ireland, has reported a data breach affecting 240,961 individuals. The incident, listed as a network server hacking incident, involved a ransomware attack by Killsec, claiming to be a hacktivist group. The breach exposed protected health information, including business files, appointment information, and data from U.S. and Canadian eyecare clients like Costco, HoustonEye, Kaiser, Mayo Clinic, Optos, Specsavers, and more. Several law firms have opened investigations into potential class action lawsuits.