Some 79% of malicious attacks on mobiles in 2012 occurred on devices running Google’s Android operating system, US authorities have said.
Public information website Public Intelligence published the Department of Homeland Security and the Federal Bureau of Investigation memo to US police and emergency medical personnel.
Nokia’s Symbian system, on the Finnish company’s basic-feature handsets, had had the second-most malware attacks.
Apple’s iOS had had 0.7% of attacks.
Android is the world’s most popular mobile operating system, and the memo blamed its high share of attacks on its “market share and open-source architecture”.
Text trojans – fake messages that trick users into clicking on premium-rate numbers – accounted for half of the Android attacks.
The memo also cited fake sites that appeared to be like Google’s Play marketplace and “rootkits” that allowed hackers to track a user’s keystrokes and passwords.