Download .apk file from market
- Download any app from the Android Market [Go]
- Install Astro File Manager from Android Market [Go]
- Open Astro > Tools > Application Manager/Backup and select the application to backup on SD card.
- Mount the phone as USB and access 'BACKUPAPPS' folder to find the apk of targetapp.(lets call this targetapp.apk).
- Copy it to your hard disk.
Decomiling apk to Dex format
- Download Dex2Jar [GO]
- Android runs applications which are in Dalvik Executable (.dex) format.
- Run the following command to convert apk to jar.
dex2jar targetapp.apk file(./dex2jar targetapp.apk on terminal)
File 'targetapp.apk.dex2jar.jar' is created |
| [Click to Enlarge] |
Viewing/Decompiling the Jar files to Java
Method 1 : Use JavaDecomiler (JD)
- Open 'targetapp.apk.dex2jar.jar' with jd-gui [Click to Download]
- File > Save All Sources to save the class files in jar to java files.
Method 2 : JAD
- Extract contents of jar file on to a folder named src. Use and unarchival utility like 7zip.
- Keep 'src' folder in the same directory where JAD and targetapp jar is present.
- Open JAD in cmd and execute the following command
jad -o -r -sjava -dsrc src/**/*.class (./jad on terminal)
Now src will contain decompiled Java files ready for manual code review.
Enjoy :)
Source : -blacksecurityup.blogspot.com