The forensic investigation confirmed that hackers had access to its internal network between March 20 and March 27, 2023, during which time they exfiltrated files that contained employee, affiliate, and client information. The ransomware attack was detected by Onix Group on March 27. Onix Group, a Pennsylvania-based real estate development firm and provider of business management and consulting services, is being sued for failing to prevent a ransomware attack in which the hackers stole the protected health information of 320,000 individuals. Onix Group Sued for Failing to Prevent Ransomware Attack and 320K-Record Data Breach