There are always underscores or hyphens between each word. Second, the titles of each interface are not formal.Windows Defender will not show you an interface like that. Windows Defender, which is also known as Windows Security, is a Windows built-in app. First of all, it is not a Windows Defender interface.However, if you are familiar with Windows Defender, you will know it doesn’t work like this. Why?Īt first glance, you might mistake this for a warning from Windows Defender. Windows Defender Security Warning Is Fake! It Is a Phishing Scam!ĭo not rush to contact the phone number the window provides because it is not a real alert. The message shows that your computer has alerted us that it has been infected with a Trojan_Spyware. The following image is a real case posted on : This situation always happens when you click a suspicious site or after you mistakenly install malware. You might also see another window with an error code and a support phone number. When you use your web browser to visit webpages, you might suddenly receive a pop-up window with a message saying Windows Defender Security Warning, access to this pc has been blocked for security reasons. What Is Windows Defender Security Warning?