Android application security testing

May 24, 20202 likes350 views

This document summarizes a presentation on advanced Android app security testing. The presentation covers Frida and Xposed frameworks for bypassing security protections like root checks, SSL pinning, and secret codes. It then compares Frida and Xposed frameworks and outlines techniques for protecting apps, including code hardening, runtime application self-protection (RASP), and code optimization.

Advanced Android app
security testing
Mykhailo Antonishyn, Access Softek, INC., Ukraine

About the speaker
Mykhailo Antonishyn
Access Softek, Inc
Ukraine

Agenda
• Frida Framework
• Xposed Framework
• Frida vs Xposed
• How to protect?

1. Introductions
• SSL pinning
• Root check

2.1. Frida Framework
How to install Frida on emulator?
1. Upload frida-server
2. Perform next command:
unxz frida-server.xz
adb push frida-server /data/local/tmp/
adb shell "chmod 755 /data/local/tmp/frida-server"
adb shell "/data/local/tmp/frida-server &"

2.1. Frida Framework
Testing connect to Frida-server:
frida-ps -U

2.2. Frida Framework
Example #1. PIN brute force :(

2.3. Frida Framework
Example #1. PIN brute force :(
(Python)

2.4. Frida Framework
Root check bypass :(:(

2.5. Frida Framework
SSL pinning bypass :(:(:(

$2.5. Frida Framework Generate new key with storepass from our exploit: keytool -list -v -keystore ./apk_unzip/assets/coincert.bks -provider org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath "bcprov-jdk15on- 156.jar" -storetype BKS -storepass "laggardness287{satisfactoriness" SSL pinning bypass :(:(:($

3.3. Xposed Framework
Developing module for root checking bypass

3.3. Xposed Framework
Developing module for secret code
bypass

3.3. Xposed Framework
Developing
module for secret
coding bypass

3.4. Xposed Framework
Standard modules for SSL
pinning bypass:
• Xposed Module: Just Trust Me
• Xposed Module: SSLUnpinning

4. Frida vs Xposed
Checks Frida Xposed
Architecture Client-server Modules on devices
Platform Cross-platform Android
Languages JS, Python, C, Swift Java
Usability Simply for advanced specialist Simply for Java/Android dev

5. How to protect?
Code hardening
• Prevents attackers from gaining insight into your
source code and modify it or extract valuable
information from it.
• Obfuscation of arithmetic instructions, control flow,
native code and library names, resources and SDK
method calls
• Encryption of classes, strings, assets, resource files and
native libraries

5. How to protect?
Runtime Application Self-Protection (RASP)
• Enables your applications to protect themselves against
real-time attacks. This prevents attackers from gathering
knowledge about their behavior and modifying it at
runtime
• Detection of debugging tools, emulators, rooted devices,
hooking frameworks, root cloaking frameworks and
tampering
• SSL pinning and Webview SSL pinning
• Certificate checks

5. How to protect?
Code optimization
• Reduces the size of your applications and
improves their performance.
• Removal of redundant code, logging code
and metadata, unused resources and native
libraries
• Code and resource optimization

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Java Architecture Java follows a unique architecture that enables the "Write Once, Run Anywhere" capability. It is a robust, secure, and platform-independent programming language. Below are the major components of Java Architecture: 1. Java Source Code Java programs are written using .java files. These files contain human-readable source code. 2. Java Compiler (javac) Converts .java files into .class files containing bytecode. Bytecode is a platform-independent, intermediate representation of your code. 3. Java Virtual Machine (JVM) Reads the bytecode and converts it into machine code specific to the host machine. It performs memory management, garbage collection, and handles execution. 4. Java Runtime Environment (JRE) Provides the environment required to run Java applications. It includes JVM + Java libraries + runtime components. 5. Java Development Kit (JDK) Includes the JRE and development tools like the compiler, debugger, etc. Required for developing Java applications. Key Features of JVM Performs just-in-time (JIT) compilation. Manages memory and threads. Handles garbage collection. JVM is platform-dependent, but Java bytecode is platform-independent. Java Classes and Objects What is a Class? A class is a blueprint for creating objects. It defines properties (fields) and behaviors (methods). Think of a class as a template. What is an Object? An object is a real-world entity created from a class. It has state and behavior. Real-life analogy: Class = Blueprint, Object = Actual House Class Methods and Instances Class Method (Static Method) Belongs to the class. Declared using the static keyword. Accessed without creating an object. Instance Method Belongs to an object. Can access instance variables. Inheritance in Java What is Inheritance? Allows a class to inherit properties and methods of another class. Promotes code reuse and hierarchical classification. Types of Inheritance in Java: 1. Single Inheritance One subclass inherits from one superclass. 2. Multilevel Inheritance A subclass inherits from another subclass. 3. Hierarchical Inheritance Multiple classes inherit from one superclass. Java does not support multiple inheritance using classes to avoid ambiguity. Polymorphism in Java What is Polymorphism? One method behaves differently based on the context. Types: Compile-time Polymorphism (Method Overloading) Runtime Polymorphism (Method Overriding) Method Overloading Same method name, different parameters. Method Overriding Subclass redefines the method of the superclass. Enables dynamic method dispatch. Interface in Java What is an Interface? A collection of abstract methods. Defines what a class must do, not how. Helps achieve multiple inheritance. Features: All methods are abstract (until Java 8+). A class can implement multiple interfaces. Interface defines a contract between unrelated classes. Abstract Class in Java What is an Abstract Class? A class that cannot be instantiated. Used to provide base functionality and enforce

Buy vs. Build: Unlocking the right path for your training techRustici Software

Investing in training technology is tough and choosing between building a custom solution or purchasing an existing platform can significantly impact your business. While building may offer tailored functionality, it also comes with hidden costs and ongoing complexities. On the other hand, buying a proven solution can streamline implementation and free up resources for other priorities. So, how do you decide? Join Roxanne Petraeus and Anne Solmssen from Ethena and Elizabeth Mohr from Rustici Software as they walk you through the key considerations in the buy vs. build debate, sharing real-world examples of organizations that made that decision.

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Android application security testing

1. Advanced Android app security testing Mykhailo Antonishyn, Access Softek, INC., Ukraine

2. About the speaker Mykhailo Antonishyn Access Softek, Inc Ukraine

3. Agenda • Frida Framework • Xposed Framework • Frida vs Xposed • How to protect?

4. 1. Introductions • SSL pinning • Root check

5. 2.1. Frida Framework

6. 2.1. Frida Framework How to install Frida on emulator? 1. Upload frida-server 2. Perform next command: unxz frida-server.xz adb push frida-server /data/local/tmp/ adb shell "chmod 755 /data/local/tmp/frida-server" adb shell "/data/local/tmp/frida-server &"

7. 2.1. Frida Framework Testing connect to Frida-server: frida-ps -U

8. 2.2. Frida Framework Example #1. PIN brute force :(

9. 2.2. Frida Framework Example #1. PIN brute force :(

10. 2.3. Frida Framework Example #1. PIN brute force :( (Python)

11. 2.4. Frida Framework Root check bypass :(:(

12. 2.4. Frida Framework Root check bypass :(:(

13. 2.5. Frida Framework SSL pinning bypass :(:(:(

14. 2.5. Frida Framework SSL pinning bypass :(:(:(

15. 2.5. Frida Framework SSL pinning bypass

16. 2.5. Frida Framework Generate new key with storepass from our exploit: keytool -list -v -keystore ./apk_unzip/assets/coincert.bks -provider org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath "bcprov-jdk15on- 156.jar" -storetype BKS -storepass "laggardness287{satisfactoriness" SSL pinning bypass :(:(:(

17. 2.5. Frida Framework SSL pinning bypass :(:(:(

18. 3.1. Xposed Framework

19. 3.2. Xposed Framework Developing module

20. 3.2. Xposed Framework Developing module

21. 3.3. Xposed Framework Developing module for root checking bypass

22. 3.3. Xposed Framework Developing module for secret code bypass

23. 3.3. Xposed Framework Developing module for secret coding bypass

24. 3.4. Xposed Framework Standard modules for SSL pinning bypass: • Xposed Module: Just Trust Me • Xposed Module: SSLUnpinning

25. 4. Frida vs Xposed Checks Frida Xposed Architecture Client-server Modules on devices Platform Cross-platform Android Languages JS, Python, C, Swift Java Usability Simply for advanced specialist Simply for Java/Android dev

26. 5. How to protect? Code hardening • Prevents attackers from gaining insight into your source code and modify it or extract valuable information from it. • Obfuscation of arithmetic instructions, control flow, native code and library names, resources and SDK method calls • Encryption of classes, strings, assets, resource files and native libraries

27. 5. How to protect? Runtime Application Self-Protection (RASP) • Enables your applications to protect themselves against real-time attacks. This prevents attackers from gathering knowledge about their behavior and modifying it at runtime • Detection of debugging tools, emulators, rooted devices, hooking frameworks, root cloaking frameworks and tampering • SSL pinning and Webview SSL pinning • Certificate checks

28. 5. How to protect? Code optimization • Reduces the size of your applications and improves their performance. • Removal of redundant code, logging code and metadata, unused resources and native libraries • Code and resource optimization

29. Any questions ?

Android application security testing

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