LOS ANGELES — Computers around the world were locked up and users' files held for ransom in a cyberattack Tuesday that paralyzed some hospitals, government offices and major multinational corporations. Here's a look at how Malware and Ransomware work and what people can do if they fall victim to attacks. WHAT IS MALWARE AND RANSOMWARE? Malware is a general term that refers to software that's harmful to your computer, says John Villasenor, a professor at the University of California, Los Angeles. Ransomware is a type of malware that essentially takes over a computer and prevents users from accessing data on...