All systems were down at branches across Jefferson County after hackers installed the malicious software, locking files and demanding money.
All branches have been closed since Monday after a ransomware attack.
Jefferson County Clerk Bobbie Holsclaw has said no personal information was compromised in the attack.
Norton provides health care across the Louisville-area and serves about 600,000 patients a year.
The "cyber event" that ended with several systems being taken offline across North Healthcare properties earlier this week came as no surprise to Dr. Roman Yampolskiy, director of the cybersecurity lab at the University of Louisville.
Federal officials are sounding the alarm about the growing prevalence of what they're calling "sextortion."
Hackers recently attacked in Bardstown, trying to get the city to pay big to restore its internet systems.
According to Indiana State Police, 35-year-old Matthew Riddle was the target of an investigation by the department.
ABS suggests the best line of defense is to regularly perform a cyber security assessment, identify any risks, eliminate any vulnerabilities, and always be on alert.
KSP began investigating Cody Lewis, 20, of Union County, Kentucky, after it was discovered he was allegedly sharing images of child sexual exploitation online.