Kali Linux for malicious code analysis

Malicious code analysis using Kali Linux is a common cybersecurity task that involves analyzing and studying malware samples to understand their functionality and behavior.

step:

1. Prepare the environment: Make sure you have installed Kali Linux and updated all tools and databases in the system.

   sudo apt-get update
   

2. Obtain a malicious sample: Obtain a malware sample, which can be obtained through public malicious sample repositories or legitimate research channels.

3. Install analysis tools: In Kali Linux, install some tools for malicious code analysis, such as:

   • Static Analysis Tools: Tools for analyzing source code, binary files, and static properties, such as file, strings, , objdumpetc.

   • Dynamic Analysis Tools: Tools for running malicious code and monitoring its behavior, such as strace, gdbetc.

4. Static analysis: Use static analysis tools to check information such as file types, strings, and system calls of malicious samples.

   file <样本文件>
   strings <样本文件>
   objdump -d <样本文件>
   

5. Dynamic Analysis: Use dynamic analysis tools to run malicious samples and monitor their behavior, either with a debugger (such as gdb) or a system call tracing tool (such as strace).

   strace ./<样本文件>
   gdb -q ./<样本文件>
   

6. Reverse engineering: If you need to deeply understand the internal functions of malicious samples, you can use reverse engineering tools, such as IDA Pro, Ghidra, etc.

Case: Malicious Code Analysis

When it comes to malicious code analysis, the following is a simple case based on Kali Linux to analyze a malicious sample using some common static and dynamic analysis tools.

Objective: Analyze a simple malware sample to understand its file attributes, strings and system calls.

step:

1. Prepare the environment: Make sure that Kali Linux has been installed and the tools in the system have been updated.

2. Fetch a malicious sample: Fetch a malware sample, such as an executable binary.

3. Static analysis:

   • View file properties:

     file <样本文件>
     

   • Extract the string:

     strings <样本文件>
     

   • Disassembly view:

     objdump -d <样本文件>
     

4. Dynamic Analysis:

   • Run and monitor syscalls:

     strace ./<样本文件>
     

   • Debug with a debugger:

     gdb -q ./<样本文件>
     

Summarize:

We selected a malicious sample and performed static and dynamic analysis using some tools in Kali Linux. File properties were viewed, strings in the sample were extracted, and disassembly was viewed in assembly code. Then a system call monitoring tool is used straceto trace the system calls at runtime, and a debugger is used gdbfor interactive debugging.

This case is just a simple example, real malicious code analysis may be more complicated. In actual analysis, it may be necessary to use more professional tools and techniques, such as reverse engineering tools, to gain insight into the internal functions of malicious samples.

Precautions:

• Malicious code analysis requires advanced skills and experience. Make sure you understand how to use the various tools and techniques.
• When analyzing malicious code, it is important to do so in an isolated environment to prevent malware from causing damage to your system.
• Respect legal and ethical principles and refrain from distributing or using malicious code samples without authorization.

Malicious code analysis is an important task in the field of network security, which can help to gain insight into the functions and behaviors of malware to improve network defense capabilities. In your study and practice, please follow the principles of legality, ethics and responsibility.