Windows Defender may stop malware and cyberattacks, consumers still need to be susceptible to a different type of threat that is gaining popularity. Microsoft warns that tech support scams are on the rise, with consumers losing between $200 and $400 per incident as a result of these social engineering attacks — something Windows users aren’t going to like hearing at all. In 2017, Microsoft received 153,000 reports from users who were victimized by these tech support scam, a 24 percent increase from a year prior, the company detailed in a security report.

These scams could occur in a number of ways. Hackers either place an unsolicited phone call to the victim, display a strategic online ad, send a phishing email, or install malware to lead consumers to believe that their systems have been compromised.

“Once connected, a fake technician (an experienced scammer) convinces the victim of a problem with their device. They often scare victims with urgent problems requiring immediate action. They instruct victims to install remote administration tools (RATs), which provide the scammers access to and control over the device,” Microsoft said. “With control of the device, scammers can make a compelling case about errors in the device and pressure the victim to pay.”

The scam issue isn’t just isolated to Windows, with technical support scams also affecting users of MacOS, iOS, and Android operating systems. The FBI reported that there were 11,000 complaints about tech support fraud in 2017, resulting in nearly $15 million worth of losses, according to ZDNet. Some scammers even threaten to take legal action if the charges for fake tech support services aren’t paid.

If you have been hit with a scam, you should notify your bank to reverse the charges, change all your passwords, uninstall any software that was installed as part of the tech support scam, and run a virus scan. Microsoft said that the best way to prevent scams is education.