Tech giant Microsoft has issued a warning to Windows users of a new type of phishing scam that involves emails requesting users to dial a call centre. Via its Security Intelligence account on Twitter, the company warned users to not dial the call centre because following the instructions given by a human operator can lead to malware infections. The malware scam only works with Windows computers that have Microsoft Excel, TechXplore reported.

The new threat involves BazarLoader, a type of malware that allows backdoor access to infected computers. It works by allowing criminals to sneak in through a hidden backdoor on a user's computer, which allows them to install viruses or other types of malware. Over the past several years, criminals have used different methods to trick users into carrying out instructions that allow BazarLoader to infect their computer, the report said.