More than 100 Android applications that were downloaded over 4.6 million times via the Google Play Store were found to contain malicious code that delivers unwanted, out-of-context (OOC) advertisements to users.

The code, a software development kit called Soraka, typically delivers its first OOC ad just after a device is unlocked, according to a new blog post report from researchers at White Ops, who discovered the threat. If the user clicks the home button to minimize this ad, a second unwanted ad appears. A third OOC ad soon follows as additional actions are taken.

In order to perpetrate its ad fraud activity, Soraka "first removes a background notification services that stops ad fraud activity when the phone screen is off," a White Ops company blog post states. "There is also code initiating fraud activity only while the device screen is on and the host app is not on top," the report continues.

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