Mobile users have been targeted by almost twice as many attacks using malicious software during 2018, going up from 66.4 million in 2017 events detected during 2017 to 116.5 million until the end of last year. Despite this large increase in the number of malicious mobile software attacks, only 5,321,142 installation packages containing malware samples were identified throughout the entire year. The most popular tools and attack techniques in the arsenal of mobile miscreants were: Droppers (Trojan-Dropper), designed to bypass detection Attacks on bank accounts via mobile devices Apps that can be used by cybercriminals to cause damage (RiskTool)
Source: https://www.bleepingcomputer.com/news/security/malicious-mobile-software-attacks-almost-doubled-in-2018/