scareware
n.β Β«Scareware is a term for applications that find fictitious malware on a userβs computer and then try to trick the user into purchasing unnecessary and fraudulent anti-malware software or services. Scareware relies on social engineering to deceive, like many phishing attacks and other forms of malware.Β» ββMac Users Targeted By βScarewareβ Fraud Application” by Thomas Claburn InformationWeek Jan. 15, 2008. (source: Double-Tongued Dictionary)