The developers of 210 mobile applications found on the Google Play Store were apparently tricked into building their programs using a malicious software developer kit that secretly implanted adware in their apps.

The apps, many of which were packaged as driving or racing simulator games, were downloaded nearly 150 million times by Android device users, according to a new blog post from researchers at Check Point Software Technologies.

Dubbed SimBad, the adware was discovered within the RXDrioder Software Development Kit, which bills itself as an ad-related SDK. "We believe the developers were scammed to use this malicious SDK, unaware of its content, leading to the fact that this campaign was not targeting a specific county or developed by the same developer," according to a company blog post written by researchers Elena Root and Andrey Polkovnichenko.

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