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Classroom Contents
The Problems with JNI Obfuscation in the Android Operating System
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- 1 About the Speaker
- 2 Android Build Process
- 3 Android Software Stack
- 4 Java Native Interface (JNI)
- 5 Why JNI?
- 6 Why Obfuscate Code?
- 7 Proguard Configuration
- 8 JNI EXAMPLE CODE
- 9 RE Time: Static Analysis!!
- 10 All eyes on the JNI Class!!
- 11 Make sure device is rooted
- 12 Step O: Make sure the application is debuggable.
- 13 Verify device is listed
- 14 List Debugable Processes
- 15 Verify that it is the correct PID
- 16 Forward Connection
- 17 Launch JDB
- 18 List Methods
- 19 Step 6: Break on method
- 20 RE Time: Dynamic Analysis!!
- 21 Retrieve APK and unzip its contents.
- 22 Create Directories
- 23 Pull System Libraries
- 24 Find the Applications Process ID
- 25 Move gdbserver on to the device.
- 26 Launch gdbserver on to the device.
- 27 Port Forward from computer to the device.
- 28 Launch arm-linux-androideabi gdb
- 29 Load Libraries and set target
- 30 RE Time: Dynamic Analysis Step 11: Set Remote Target
- 31 Set Breakpoints
- 32 Step Through and get results.
- 33 Why did obfuscation fail?
- 34 How do we solve this problem?
- 35 Solution 1: Register Natives
- 36 Problems with Solution 1?
- 37 Classes
- 38 Problems with Solution 2?
- 39 Suggestions
