Cyber security systems everywhere are struggling to defend against evolving digital threats catalyzed by COVID-19’s far-reaching effects. — State-backed hackers and other cybercriminal groups have ramped up devastating ransomware attacks on health care systems, government organizations, companies and researchers collaborating on coronavirus treatments and vaccines. The U.S. Department of Homeland Security (D.H.S.), Cybersecurity and Infrastructure Security Agency (C.I.S.A.) and the U.K.’s National Cyber Security Centre (N.S.C.S.) issued a…