The outage appeared to stem partly from a software update issued by CrowdStrike, a cybersecurity company that detects and block hacking threats.

Norton said it received a "suspicious message" on May 9 and took several systems offline as a precaution.

Taylor Regional Hospital said its system, including its phones, are down as they work to restore them "quickly and safely." 

Unemployment officials are working with the Kentucky Office of Homeland Security, the state's Labor Cabinet and the Commonwealth Office of Technology to address the attack.