🛡️ System Security Manager (AdBlock & DNS Tool)

A lightweight, portable, and open-source PowerShell tool designed to enhance your system’s privacy and security. It allows you to easily switch DNS providers and block advertisements/trackers system-wide using the Hosts file.

📸 Screenshots

The modern, dark/light-themed UI allowing quick DNS toggling and host file updates.

✨ Features

• 🌐 DNS Manager: - Quickly switch between popular DNS providers (Google, Cloudflare, Quad9, AdGuard, OpenDNS).

• Easily revert to Default (DHCP) with a single click.

• 🚫 System-Wide AdBlocker: - Blocks ads, trackers, and malicious domains by modifying the Windows hosts file.

• Aggregates blocklists from trusted sources (StevenBlack, AdAway, Yoyo).

• 🧠 Smart Merge Logic: - Preserves your data: If you have custom entries in your hosts file (e.g., for local development), this tool will not delete them. It only manages its own blocklist section.

• 🎨 Modern UI: - Clean WPF-based Graphical User Interface.

• Auto-Theme: Automatically adapts to your Windows Light or Dark mode settings.

• 📦 Portable: - Single .ps1 file. No installation required.

🚀 Getting Started

Prerequisites

• OS: Windows 10 or Windows 11 (64-bit required).
• Permissions: Must be run as Administrator (required to modify Network settings and System files).

Installation & Usage

Option 1: Using the Executable (Recommended)

1. Download the latest AdBlockDNS.exe from the Releases Page.
2. Double-click AdBlockDNS.exe to run.

Option 2: Running the Script (For Developers)

1. Download the source code.
2. Right-click AdBlockDNS.ps1 and select Run with PowerShell.

• Note: If you encounter an Execution Policy error, run this command in PowerShell once:

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass

🛠️ How It Works

1. DNS Changer: Uses native PowerShell commands (Set-DnsClientServerAddress) to change the DNS servers of your active network adapter.
2. Hosts Blocker: - Downloads raw text lists of ad-servers.

• Parses and formats them into a Windows-compatible format.
• Appends them to C:\Windows\System32\drivers\etc\hosts inside a tagged block.
• Creates a backup (hosts.bak) automatically before the first run.

⚠️ Disclaimer

This tool modifies system files (hosts) and network settings. While it includes safety features (backups and smart merging), use it at your own risk.

• Always ensure you have a system restore point if you are unsure.
• VPNs or other security software might conflict with DNS settings.

📄 License

This project is licensed under the MIT License.

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Created by @osmanonurkoc