You have probably run into a web site that pretends to be Microsoft stating that something is wrong with your computer and telling you to call their phone number for help. While most antivirus software will detect these types of tech support scams, new tactics are being used by their creators to make them more difficult to detect. […]

from https://www.bleepingcomputer.com/news/security/tech-support-scams-using-multiple-obfuscation-methods-to-bypass-detection/