The results of the real-time guard functionality were quite shocking. The guard should warn the user
upon installation of malicious apps. The 10 malware samples were chosen with the help of AV-TEST's
own analysis system, which uses more than 30 virus scanners to analyze the APK files. The test set
contains the 10 files, which were most often classified as malware by the virus scanners. Because of
the high detection rates these files can be considered as well known and should therefore be
detected by a reliable virus-scanner. Did the vendors of mobile security apps know them, too? The
test results will show: Zoner AntiVirus Free was the only app with a respectable result. It detected 8
out of 10 samples during the installation attempts. BluePoint AntiVirus Free, Kinetoo Malware Scan
and Privateer Lite still warned against one malicious app. Antivirus Free by Creative Apps, GuardX
Antivirus and LabMSF Antivirus beta failed completely. In comparison to the free apps the
commercial products of F-Secure and Kaspersky detected all threats without a problem.
The number of installations, which is given on the market website, shows that many users trust these
free apps, although they do not offer a reliable protection. The by far most popular program is
Antivirus Free by Creative Apps with 1,000,000 to 5,000,000 installations. The only useful free
product Zoner AntiVirus Free has just 50,000 - 100,000 users. The best protection was achieved by
the commercial tools of the well known security software vendors Kaspersky and F-Secure. The
circulation of obviously near to useless security apps endangers those, who trust them and install
apps from 3rd party app markets without further suspiciousness
http://www.av-test.org/fileadmin/pdf/avtest_2011-11_free_android_virus_scanner_english.pdf (PDF)