(BBC) – Security firm Avast said that one of the apps involved – a free version of the card game Durak – had been downloaded up to 10 million times, according to Google Play’s own counter.
Google has now blocked access.
But one expert noted that the problem might be less widespread than feared.
The “adware” was causing spurious pop-up messages to appear that had been made to look like system notifications. These told him his phone was running “slow” and that he needed to install new software to fix the problem.