Millions of Android smartphones have reportedly been hijacked in a drive-by cryptocurrency mining campaign. As per security researchers, over the past few months, hackers have secretly been mining Monero coins via smartphones.

According to Malwarebytes researchers, the campaign was first observed in January though it had started around November last year. According to the report, millions of Android mobile users have been redirected to a specifically designed page “performing in-browser cryptomining.”

Though the method, the report says, is “automated, without user consent, and mostly silent,” visitors are presented with a CAPTCHA to solve to prove that they are human and not a bot. The warning message reads as “Your device is showing suspicious surfing behaviour.

Please prove that you are human by solving the captcha. Until you verify yourself as human, your browser will mine the Cryptocurrency Monero for us in order to recover the server costs incurred by bot traffic.”

Until a user enters the code, the smartphone or tablet continues mining Monero, damaging the device’s processor. Also see: How to Stop Websites From Using Your Phone or Computer to Mine Bitcoin and Other Cryptocurrencies  Interestingly, upon clicking entering the code, users are redirected to the Google home page, the report says. Read more from…

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