By Martin N Wilson

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It enumerates the APK files of all non-system applications as well as all files from the memory card. It then reads the content of each file into a buffer and passes it separately from the Java scanning engine to the native library. The scanning function in the native library distinguishes between four filetypes: DEX files, ZIP files, ELF files and the EICAR file, which is a test file that is supposed to be detected by every antivirus software. In case the filetype is a ZIP file (APK files are basically ZIP files), it then extracts all DEX and ELF files and passes their content to the scanning function again.

The package name is enciphered with AES and then encoded using Base64 (see the decompiled code in fig. 2). When the application scans, it compares the package name of the application it currently scans with all the entries in the database. Obviously, this mechanism is not very strong. Only comparing package names makes it very Security Add-Ons for Mobile Platforms 25 easy for malware authors to evade detection. The only thing they need to do is change the package name of the application. All the application’s functionality can remain the same.

G. detect the download of a malicious application and warn before it is installed. Another interesting characteristic of antivirus software on mobile devices is where they scan for viruses. All the antivirus software that we investigated seem to perform the scanning on the device itself. Another possibility would be to perform scanning by a cloud based service to reduce battery consumption, as already explained in Section 2. We searched the Google Play Store for antivirus software that scan for malware in the cloud.

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