According to a report, a Chinese ad agency is employing malware on Android mobiles to rake in an estimated $300,000 per month.
Once a user has an infected device the malware installs more apps to compound the issue.
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motherboard.vice.com...]
Only recently I added anti-virus protection to my Android device as i'd thought it wasn't a problem, however, it's clear that this, and others are targeting the weakest points.