A Google spokesperson said, "We've removed the apps from Play, disabled the developers' accounts, and will continue to show strong warnings to anyone that has installed them".
The so-called AdultSwine malware, which displayed "highly inappropriate ads" affected apps reportedly downloaded between 3 and 7 million times. That includes displaying the bogus ads, scaring users to insecurity fake security apps and charging victims for services they didn't request or receive.
When the malicious code is installed onto your phone, it waits for the user to unlock the device to start the malicious activity.
In this case, the hidden code inside the offending apps, dubbed AdultSwine, will either show pornographic ads from a third-party server or through the code's own ad library, Check Point said.
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Android smartphone users are regularly advised to download apps only from official sources such as Google Play to avoid malware, but security researchers have again found malicious apps in the store. It might, for example, tell users they could win a "free iPhone" by answering a few questions before prompting them to enter a phone number.
Along with encouraging users to download scareware and pay for premium services, AdultSwine also stole users' credentials, according to Check Point. Some of the gaming apps were named San Andreas City Craft, Addon Sponge Bob for MCPE, McQueen Car Racing Game and Subway Banana Run Surf.
Effective protection from attack by these malware-infected games requires users to install advanced mobile threat defence on all mobile devices.
The company is "struggling to keep certain malware outside the App store" because some nasty code can only be detected by dynamically analyzing the context of an app's actions, which is hard to do, a Check Point researcher explains.
"'AdultSwine' is a particularly insidious malware able to cause emotional distress and financial fraud".