[Ilikecrackers]

1. Basic preparation stage

• Learn the basic knowledge of Android system
  Understand the Android system architecture, including the application layer, framework layer, system runtime layer and Linux kernel layer.Be familiar with the components of Android applications, such as APK file structure, four major components (Activity, Service, BroadcastReceiver, ContentProvider), etc.
  
• Master the basics of programming
  Be proficient in Java and Kotlin programming languages, which are the main languages for Android development.Understand C/C++ language, because NDK development and underlying code analysis may be involved in Android reverse engineering.
  
• Tool preparation
  Install Android Studio for analyzing and debugging Android applications.Prepare decompilation tools, such as Apktool, Jadx, etc., to decompile APK files into readable code.Install dynamic analysis tools, such as FrIDA, Xposed, etc., to modify and analyze applications at runtime.
  

2. Static analysis stage

• APK decompilation
  Use decompilation tools to decompile APK files into Smali code or Java code.Analyze the decompiled code structure to understand the application's functions and logic.
  
• Resource file analysis
  View the application's resource files, such as layout files, string resources, images, etc., to understand the application's interface and interaction design.Analyze the encrypted information or hidden functional clues in the resource files.
  
• Code analysis
  Read the decompiled code to find key functions and logical flows.Analyze the code implementation of key parts such as encryption algorithms, authorization verification, and network communication.
  
• Signature analysis
  Check the APK's signature information to understand the application's developer and release channel.Analyze whether the signature has been tampered with or forged.
  

III. Dynamic analysis phase

• Install and run the application
  Install the application on a simulator or real device and observe the application's running behavior.Record the application's startup process, interface switching, network requests, and other behaviors.
  
• Use dynamic analysis tools
  Use tools such as Frida or Xposed to modify the application's behavior at runtime, such as intercepting function calls, modifying parameters, injecting code, etc.Observe the application's response and analyze its internal logic and security mechanism.
  
• Network analysis
  Use network packet capture tools such as Wireshark or Charles to analyze the application's network communication.Check the parameters, response data and encryption method of network requests.
  
• Memory analysis
  Use memory analysis tools such as GDB or IDA Pro to analyze the memory layout and data structure of the application at runtime.Find the storage location of sensitive information, encryption keys, etc. in memory.
  

IV. Advanced technology stage

• Undercovering technology
  Understand the shelling principle and common shelling tools of Android applications.Learn shelling techniques, such as manual shelling and using shelling tools, to obtain the original APK file.
  
• NDK reverse
  Analyze the NDK code in Android applications and understand the implementation of C/C++ code.Use tools such as IDA Pro for disassembly and analysis.
  
• Kernel analysis
  Understand the kernel structure and working principle of the Android system.Analyze the security mechanism and vulnerability exploitation in the kernel module.
  
• Security assessment
  Perform security assessment on the reversed application to find potential security vulnerabilities and risks.Propose security suggestions and improvement measures.
  

V. Practice and summary stage

Actual project practice
Select some actual Android applications for reverse analysis and accumulate experience.
Try to crack some simple application protection mechanisms, such as encryption, authorization verification, etc.
Summary and sharing
Summarize the experience and lessons learned in the reverse process, record the problems encountered and solutions.
Share your own reverse results and experience, and communicate and learn with other reverse enthusiasts.

Summarize

1.Essential knowledge and tools

• Android basics: Understand the basic structure of APK files, such as Manifest files, resource files, dex files, etc.
  
• Java and Smali syntax: Familiar with Java programming language and Smali syntax, the latter is a common intermediate language in Android reverse engineering
  
• Android operation mechanism: Understand the operation process of Android applications,
  
• Decompilation tools: such as APKTool, JD-GUI, JEB, etc.,
  
• Debugging tools: such as Android Studio, IDA Pro, Frida, etc., for dynamic debugging and analysis of applications
  
• Hook tools: such as Xposed, Substrate, Frida, etc., for modifying the behavior of applications at runtime
  

2. Environment configuration and tool use
Configure Android development environment: Download and install Android Studio

Familiar with decompilation tools:
Use APKTool to unpack and repack APK files.
Use JD-GUI to quickly read Java source code
Use JEB for deeper analysis

3. Smali syntax and modification
Learn the basics of Smali syntax, which is the key to modifying the code in APK

4. Cracking and protection
Learn how to crack the encryption and protection measures of the application, and understand common application protection technologies, such as code obfuscation, shelling, etc.

5. Learning resources and advanced paths

Video tutorial: "Android Reverse Development Video Tutorial"
Book: "Android Security and Reverse Practice"
Online courses: Android reverse courses on platforms such as Coursera and Udemy

6. Hardware configuration
Computer: Mainstream computer configuration is fine, with as much memory as possible and as high a main frequency as possible. If conditions permit, install a virtual machine on the computer to install the Linux system.
Mobile phone: Android phone, if conditions permit, use Google's own son (nexus or pixel)

7. Create your own Android reverse environment

The development system can be Win10, Linux

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I'm sorry that you all laughed at me for posting this, this is just my little knowledge. If you have better knowledge, I hope you can share it.

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I'm sorry that you all laughed at me for posting this, this is just my little knowledge. If you have better knowledge, I hope you can share it.