Online games players are being bombarded with pop-up ads by an aggressive Trojan Android app. They are then conned into thinking that the ads will disappear if they give the app a bogus five-star review. As well as contravening Google Play Developer Policy on placing phoney reviews, it also has no effect on the flood of irritating ads.
To remove the malicious app and payload from a device, researchers suggest disabling the malicious app’s device administrator rights under ‘Permissions Required’, then uninstalling the ‘plugin Android’ payload within the Application Manager.
As a consequence, maybe Google Play users should take all reviews with a pinch of salt.