Download the Wrong App and Have More Than Pokémon Fever Infect Your Device

There’s a new augmented reality game on the market these days. Perhaps you’ve heard of it - a title called Pokemon Go, which lets you capture virtual monsters that “appear” on your smartphone’s camera. However, hackers have seized this opportunity to infect players’ mobile devices with a backdoor called DroidJack, which uses the mobile app’s immense popularity to its advantage.

As one of Nintendo’s most popular gaming franchises, it shouldn’t come as a surprise that Pokemon Go has experienced such a warm reception amongst both new and old fans of the series. It’s ranked as the #1 most downloaded app on both the Apple Store and Google Play store, and was so wildly successful that Nintendo’s stock surged following its release. With over 75 million users worldwide, it has more users than some of the most popular smartphone apps, including Tinder, Twitter, and Google Maps.

Of course, hackers have to ruin the most popular of things, and they made an attempt to exploit this in the form of a malicious APK (Android application package). The game experienced a soft release, probably in order to ensure that the servers (which many Pokemon Go gamers suspect is simply a closet full of potato electrodes due to frequent crashes) could handle the traffic volume, which left many countries around the world without access to the game at first.

Thus, impatient fans made attempts to download the APK file and “side-load” it onto their devices - a major no-no for any security-minded mobile device user. Basically, you have to allow app installation from unknown sources, which is frowned upon due to some apps containing malware, or unnecessary permissions. Yet, those who wanted to play the game didn’t think for one second that what they were really downloading was a backdoor into their devices.

Due to the exclusivity of the application in the days before its release, many users outside of a select few countries chose to download the APK from an unknown source and just rolled with it. Today, the app is available in many countries, but a modified APK that was released online prior to the official release allowed remote access to the device, and can provide full control over the victim’s phone. In worst-case scenarios, this vulnerability extends to the rest of any network that the device is connected to. Security firm Proofpoint suggests that it’s entirely possible that, should infected devices connect to your network, networked resources can also be put at risk.

Take a look at the DroidJack-infected app’s permission request, and see for yourself just how strange they might look.

https://www.proofpoint.com/sites/default/files/users_content/10/pokemon-fig2.png
https://www.proofpoint.com/sites/default/files/users_content/10/pokemon-fig3.png

This is a valuable lesson to anyone who uses a smartphone: be careful of what apps you download, and ensure that you aren’t giving your apps too many permissions. There’s almost no reason that a game of any kind should be able to access your text messages, make phone calls, modify your contacts, record audio, or anything else of the sort. Exploitation of the APK hasn’t necessarily been observed in the wild, but a development such as this, where hackers use popular apps to spread their infections, sets a dangerous precedent that cannot be ignored.

You should never install apps from unknown sources in the first place, especially on company devices and smartphones. It’s especially important that you only download apps from reputable sources, like the Apple store and the Google Play store.

After all, “Gotta catch ‘em all,” shouldn’t refer to malware infections.