According to a new report, Android malware has increased 400% since 2010, as more and more devices based on the open source platform make their way into the market.

According to the report titled, "Malicious Mobile Threats Report 2010/2011" released by Juniper Networks, cyber criminals are increasingly focusing their efforts towards mobile devices.

The report showed that SMS Trojans was the highest threat, accounting for 17% of all reported infections and the biggest distribution point for mobile malware is application download. Several smartphone users do not have active anti-virus software.

"These findings reflect a perfect storm of users who are either uneducated on or disinterested in security, downloading readily available applications from unknown and unvetted sources in the complete absence of mobile device security solutions," said Dan Hoffman, chief mobile security evangelist at Juniper Networks.

Meanwhile, a Taiwanese security firm, AegisLab has detected 11 Android apps containing malware that automatically sends text messages from your Google Android smartphone to phone numbers in China. The apps, including iBook, iCartoon, iGuide, iCalendar, LoveBaby and Sea Ball, contain a code that covertly sends text messages to three different premium-rate numbers and sign the victims up for paid subscription services.

Google has removed the offending apps, published by "zsone," from the official Android Market. However, security experts warn that the malware could have infected more apps than the eleven already detected.