Hello, aspiring ethical hackers. In our previous blogpost of Computer virus, you have learnt what is a virus, its functions and about different types of viruses. In this article, you will learn how to create a Virus manually.
However, note that it is only for educational and knowledge purposes and not for performing any malicious purpose. The aim of this article is to give you a basic understanding on how to create a virus. Let’s begin.
Creation of a computer virus consists of six steps. They are,
- 1. Decide the function you want your virus to perform.
- 2. Select a programming language in which you want to code your virus.
- 3. Code the virus.
- 4. Compiling the virus.
- 5. Testing.
- 6. Sharing the Virus.
Let’s learn about each step in detail.
1. Function of a virus:
Before you even start coding a virus, you need to decide what exactly you want your virus to do. In real-world, computer viruses perform many functions that include downloading and installing additional viruses, wiping data from the infected system and even taking complete control of the system. For example, I decide that my virus should open a Firefox browser when executed.
2. Choose your language:
After deciding the function of your virus, next thing you have to do is choose a programming language to code this virus. Computer viruses can be written in many programming languages like C, Deslphi, Visual Basic, C#, C++, Cobol, Ruby, Python etc. They can also be created using scripting languages like JavaScript, Batch script, Bash, PowerShell etc. Choose the programming or scripting language of your choice. For example, I want to write my virus in Batch scripting.
3. Write code:
3. Write code:
Once you select the programming language or scripting language, you need to code the virus. To code a batch script, all I have to do is open a notepad, add the code shown below and save the file as Batch file (with extension .bat)
@echo off
start firefox.exe
4. Compile (if necessary):
Compile the virus. Compiling is a process of converting source code into machine-readable code so that a computer can execute it. Since we have written our code in Batch, it doesn’t need any compilation. But programs written in C,C++, Python need compiling. Compiled programs are usually fast.
5. Test the virus:
Once you have finished coding the virus and compiling it, test its working by executing the virus. I execute the Batch virus I created and it open Firefox browser as shown below.
6. Share the virus:
The last step is to share the virus to make your target user execute it. Normally hackers use social engineering or phishing schemes to spread the virus.
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