The interesting turn of events surrounding the game Flappy Bird has had the Internet buzzing: after becoming massively popular (downloaded more than 50 million times), the developer suddenly announced that he will take down the game from app stores, and then actually did it. The decision brought the interest around the game to an even greater scale, with similar apps seen emerging in app stores, and even auctions for devices with the app installed. The next development we saw, however, is a less desirable one: we found a bunch of fake Android Flappy Bird apps spreading online. Especially rampant in app markets in Russia and Vietnam, these fake Flappy Bird apps have exactly the same appearance as the original version: Other fake versions we've seen have a payment feature added into the originally free app. These fake versions display a pop up asking the user to pay for the game. If the user refuses to play, the app will close. These fake Flappy Bird apps are now detected as ANDROIDOS_AGENT.HBTF, ANDROIDOS_OPFAKE.HATC, and ANDROIDOS_SMSREG.HAT. We advise Android users (especially those who are keen to download the now “extinct” Flappy Bird app) to be careful when installing apps. Cybercriminals are constantly cashing in on popular games (like Candy Crush, Angry Birds Space, Temple Run 2, and Bad Piggies) to unleash mobile threats. Our past entry, Checking the Legitimacy of Android Apps, enumerates some tips on how to do avoid suspicious or malicious apps. Users may also opt to install a security app (such as Trend Micro Mobile Security) to be able to check apps even before installation.