Least privilege won’t solve every security problem, but it’s a significant step in the right direction, he says. There are lots of reasons to use least privilege mechanisms, UAC or otherwise, he writes. Malware writers may easily code around least privilege when they need to, but this cuts down on software that can cause harm today. He says most of today’s malware relies upon the end-user installing or clicking on something they shouldn’t, as well as having admin or root access.”]
Source: https://www.csoonline.com/article/2633119/computer-security–why-have-least-privilege-.html