Trojans are the dominant mobile malware form in Germany. Mobile Trojans commonly exploit premium SMS services. The Trojan signs up a mobile phone user to one or several of those services without the owner's knowledge.
In the United States, there's a prevalence of "surveilanceware." That may be because surveilanceware has quasi-legal status in the country due to a number of court cases involving spouses spying on spouses, Linden noted.
One region where mobile threats haven't proliferated as widely as others is Japan. "That is due to the fact that premium SMS doesn't exist in Japan," Linden said.
"Japan is interesting because it shows that once you remove a malware author's easy monetization strategy, you remove their incentive to target a region as much," he said
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