The assailants often operate from American adversaries such as Russia, North Korea and Iran, where they enjoy big payouts from their victims and face little prospect of ever being punished.
In November, a ransomware attack on a health care chain that operates 30 hospitals and 200 health facilities in the United States forced doctors to divert patients from emergency rooms and postpone elective surgeries. Meanwhile, a rural Illinois hospital announced it was permanently closing last year because it couldn’t recover financially from a cyberattack. And hackers went as far as posting photos and patient information of breast cancer patients who were receiving treatment at a Pennsylvania health network after the system was hacked last year.