Check your Android now. Photo: Cult of Android

Most of us are good at hiding our browsing habits when we need to, but it turns out your Android device might be even better at it. Thanks to a malicious app distributed through Google Play, some devices have been browsing porn sites in the background without their owner’s knowledge.

Android’s built-in malware scanner can’t be completely trusted just yet.

With its Android 4.2 Jelly Bean upgrade, Google provided its users with extra protection by introducing an extended malware scanner that’s designed to prevent malicious applications from making their way onto your smartphone or tablet. Not only does it scan the apps you download from Google Play, but also those you acquire from third-party sources, such as Amazon’s Appstore.

It gives Android users peace of mind. The only problem is, new research has proven that the feature is largely worthless. When Google’s malware scanner was put through its paces, it was able to detect just 15.32% of malicious apps.