Rogue security software are applications that warn users of infections that do not exist in order to trick them into buying the full product. Most of these applications are considered adware and/or spyware. The most widely spread technique to trick users into buying such software is that of false positives. False positives are fake/false e-threat detections that appear during a compu.ter scan. Some software, like SpyAxe will automatically download software without any user interaction (drive-by download)”]
Source: https://www.bitdefender.com/blog/hotforsecurity/rogue-security-software-from-a-to-z/