The WannaCry cyberattack on Friday, May 12, 2017 was the largest international ransomware attack to date.

Victims of the attack range in size—from Fortune 500 to small/medium-sized businesses—and industry—from academic institutions to large banks, health care providers and transportation networks. The U.K.’s health care regulatory agency, the National Health Service (NHS), was a major target. The attack’s devastating scale in exploiting data security vulnerabilities is a good reminder of how critical it is for health care organizations to conduct comprehensive security assessments immediately and regularly.

We took a close look at the WannaCry ransomware incident and have some tips for what organizations need to know to minimize their risk in this article.