Hackers hijacked millions of mobile devices over recent months to generate illegal human coins , according to Malwarebytes researchers . "Your device is showing suspicious surfing behaviour. Mobile users are directed to a page containing a CAPTCHA request to prove they are human and are advised that their browser will mine the cryptocurrency Monero to recover server costs incurred by bot traffic . Carlos Segura , lead malware intelligence analyst at Malwarebytes , estimated the scheme is only making a few thousand dollars each day , but this could quickly rise as cryptocurrencies gain value . More than 4,000 UK , US and Australian websites were used to mine cryptocurrency over the 10 - 11 February weekend .
Hackers hijacked millions of mobile devices over recent months to generate illegal human coins , according to Malwarebytes researchers . Mobile users are directed to a page containing a CAPTCHA request to prove they are human and are advised that their browser will mine the cryptocurrency Monero to recover server costs incurred by bot traffic . Carlos Segura , lead malware intelligence analyst at Malwarebytes , estimated the scheme is only making a few thousand dollars each day , but this could quickly rise as cryptocurrencies gain value . More than 4,000 UK , US and Australian websites were used to mine cryptocurrency over the 10 - 11 February weekend .