Only 7 of the 41 virus scanners had detection rates above 90 percent, with over half of the remaining apps having detection rates under 40 percent. The top 7 apps were Avast Mobile Security, Dr. Web Anti-virus Light, F-Secure Mobile Security, IKARUS Mobile Security Lite, Lookout Mobile Security, Kaspersky Mobile Security Lite, and Zoner AntiVirus Free. Out of those 7, Kaspersky and F-Secure had the highest detection rates, followed by Avast.

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http://www.pcworld.com/businesscenter/article/251345/which_android_security_tools_are_worth_your_time.html