Firm calls out consistent rise of "madware" in Google Play

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In the first half of the year, 23.8 percent of all free Google Play apps were plagued with ads that could potentially become a privacy concern for users, if not a serious nuisance, a security firm found.

The “Mobile Adware and Malware Analysis” report (PDF), published on Tuesday by Symantec, revealed that the percentage of apps containing “madware” – defined as apps using overly aggressive ad libraries – has consistently increased since 2010.

Last year, for instance, 15 percent of free Google Play apps contained madware, Symantec discovered.

The report explained the different classes of ad libraries, which have the ability to collect information about app users for advertisers. The "madware" apps contained the most concerning ad libraries, which leaked private data, like phone numbers or user account information, or exhibited behaviors that were considered a major annoyance, like displaying ads in device notification bars.

Some madware even caused apps to play voice ads when users made phone calls, the report revealed.

In a Tuesday interview with, Kevin Haley, director of Symantec Security Response, further addressed why the growing trend of madware in Android apps is reason for concern.

“When you think about it, if I want to double my money [as an app developer], I could sell more apps or I could double the number of ads that show in my application,” Haley said. “[Now], there is a class of app developers that have decided they are going to make money by making users' experience worse and I think we are all going to suffer from that.”

Haley also added that the mobile ads that become a nuisance are usually hard to remove.

“This is pumping those ads into your phone, and if you don't want those adds, you have no idea what application is doing this,” he said. 

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