From gbhackers.com
The researcher discovered a four most popular VPN for Android that installed over 500 million users committing ad fraud and pushing unusual ads in users device to generate revenue.
The four most popular Android VPN’s are HotSpot VPN, Free VPN Master, Secure VPN, CM SecurityApplock AntiVirus that are pushing the pop up ads even when the apps are running in the device background and also generates frequent HTTP request which overheats the phone and drain battery.
There are several adware incidents reported in the past few months, and it’s rapidly growing to exclusively target the Android users to generate millions of dollars revenue.