ESET researchers have observed an increased number of apps on Google Play using social engineering techniques to boost their ratings. Among these falsely high-ranking apps, an aggressive ad-displaying trojan was spotted, installed by up to 5000 users as a tool to download content from YouTube. Similar deceptive techniques have been used in a number of ads-driven apps with a total of 800,000 installs. These apps force users into leaving high ratings under various pretences, which in turn makes them more likely to be downloaded.”]