In a recent report, Google cites that the incidence of fake anti-virus products [Fake AV] are on the rise. In its report, Google states that such attacks do not require any user intervention and that the malicious code is installed automatically without the user even being aware of it. I have personally seen this types of attacks on some of my clients’ computer systems, and these can usually be removed by a good A/V cleaner or scrubber.
The report from Google also states:
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I have found both Malwarebytes and Spyware Doctor with anti-virus to be effective.