An anonymous reader writes: Back in 2012, Android accounted for 79 percent of all mobile malware. Last year, that number ballooned even further to 97 percent. Both those data points come from security firm F-Secure, which today released its 40-page Threat Report for the second half of 2013. More specifically, Android malware rose from 238 threats in 2012 to 804 new families and variants in 2013. Apart from Symbian, F-Secure found no new threats for other mobile platforms last year.