One of the malicious apps from this set named 'multiapp multiple accounts simultaneously' has crossed 5 million installs and out of the 29 apps, 24 are from 'HiddAd' category that hides the icon after first launch and create a shortcut on home screen of the phone.
According to Quick Heal Security Labs, the purpose of the apps is to not let users uninstall it by just dragging the icon.
"The remaining 5 apps are of 'Adware' category and would generally get into your Android phones through advertisements. Users see many advertisements every time they visit social media sites like YouTube, Facebook, etc, which promote different mobile applications.
"Many a times, these promoted mobile applications boast about a lot of unbelievable functionalities like X-Ray scanning. We came across few advertisements of some interesting Android apps which claim to offer functionality of X-Ray scanning. When we explored the App further, we found out that two such apps have crossed 1 million+ downloads already," the company said in a statement.
The 'Adware' apps pretend to offer a functionality of magnifying the view, but in reality these show heavy advertisement on user's mobile, eventually draining phone battery and causing heavy data usage and productivity loss.
"Right after the launch, these applications open camera and show various options like flash light, gallery, etc. But when user chooses an option, these apps start full screen ads, with no option to close or skip," the company added.
( With inputs from IANS )