All malware is bad, but ransomware is particularly insidious—ask any ransomware victim. That's why a new attack scheme called “Pacman” has raised alarms, because it's even nastier than usual. Think of the classic Pac-Man game's voracious yellow ball, chomping up all of your files. It takes only one click to infect a vulnerable PC, and the attack gives victims only 24 hours to pay the ransom in Bitcoins or risk losing all of the compromised data.