Getty Images More than 7,000 apps were infected with a trojan, one security firm said. Courtesy of Getty Images

Security researchers say they have discovered a huge botnet running on the smartphones of more than a million unsuspecting mobile users in China.

The devices had been infected by a Trojan-based attack first discovered in 2011, news agency Xinhua reported. The botnet can allow the smartphones to be hijacked remotely and potentially used for fraudulent purposes.

The warning comes as mobile internet use in the country has soared, growing by more than 18 percent in the past year. There are now more than 420 million mobile users, according to the China Internet Network Information Center (Cinic).

China Mobile Users Warned about Large Botnet | DFI News.

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