# Download legitimate Avast from official sources only
# Visit: https://www.avast.com/
# Use official API documentation for integration

// Example: Analyzing antivirus behavior in isolated environment
// Always use official samples and legal frameworks

#include <windows.h>
#include <iostream>

// Study antivirus hooks and behavior monitoring
class AntivirusAnalyzer {
public:
    void analyzeFileSystemHooks() {
        // Research how AV monitors file operations
        // Use in isolated VM/sandbox only
    }
    
    void studyBehaviorDetection() {
        // Understand heuristic analysis
        // Educational purposes in controlled environment
    }
};

// Example: Implementing basic file scanning
#include <filesystem>
#include <fstream>
#include <vector>

class SimpleScanner {
private:
    std::vector<std::string> signatures;
    
public:
    bool scanFile(const std::string& filepath) {
        std::ifstream file(filepath, std::ios::binary);
        if (!file.is_open()) return false;
        
        // Read file content
        std::vector<char> buffer(
            (std::istreambuf_iterator<char>(file)),
            std::istreambuf_iterator<char>()
        );
        
        // Check against signatures
        for (const auto& sig : signatures) {
            // Pattern matching logic
        }
        
        return true;
    }
    
    void addSignature(const std::string& sig) {
        signatures.push_back(sig);
    }
};

# Always use isolated virtual machines
# Never test on production systems

# Example: Setting up research VM
VBoxManage createvm --name "SecurityResearch" --register
VBoxManage modifyvm "SecurityResearch" --memory 4096 --cpus 2
VBoxManage modifyvm "SecurityResearch" --nic1 intnet

// Analyzing security software behavior safely
#include <windows.h>

class SafeAnalyzer {
public:
    // Monitor API calls in controlled environment
    void monitorAPICalls() {
        // Use tools like API Monitor, Process Monitor
        // Document behavior for educational purposes
    }
    
    // Study process injection detection
    void studyInjectionDetection() {
        // Understand how AV detects malicious injection
        // Research SetWindowsHookEx monitoring
        // Study CreateRemoteThread detection
    }
    
    // Analyze file system minifilter drivers
    void analyzeFileSystemFilter() {
        // Research how AV intercepts file operations
        // Study IRP (I/O Request Packet) handling
    }
};

#include <windows.h>
#include <string>
#include <set>

class RealtimeProtection {
private:
    std::set<std::string> monitoredExtensions = {
        ".exe", ".dll", ".scr", ".bat", ".cmd", ".ps1"
    };
    
public:
    // File system monitoring using ReadDirectoryChangesW
    void startMonitoring(const std::wstring& directory) {
        HANDLE hDir = CreateFileW(
            directory.c_str(),
            FILE_LIST_DIRECTORY,
            FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
            NULL,
            OPEN_EXISTING,
            FILE_FLAG_BACKUP_SEMANTICS,
            NULL
        );
        
        if (hDir == INVALID_HANDLE_VALUE) {
            return;
        }
        
        BYTE buffer[1024];
        DWORD bytesReturned;
        
        while (ReadDirectoryChangesW(
            hDir,
            &buffer,
            sizeof(buffer),
            TRUE,
            FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE,
            &bytesReturned,
            NULL,
            NULL
        )) {
            // Process file changes
            FILE_NOTIFY_INFORMATION* fni = 
                reinterpret_cast<FILE_NOTIFY_INFORMATION*>(buffer);
            
            // Scan new/modified files
            scanFileOnChange(fni->FileName);
        }
        
        CloseHandle(hDir);
    }
    
private:
    void scanFileOnChange(const wchar_t* filename) {
        // Implement scanning logic
    }
};

# Get legitimate Avast
# Visit: https://www.avast.com/free-antivirus-download

# Or use built-in Windows Defender
# Already included in Windows 10/11

// Use Windows Defender API for integration
#include <windows.h>
#include <MpClient.h>

// Or study open-source antivirus projects:
// - ClamAV (https://www.clamav.net/)
// - YARA (https://virustotal.github.io/yara/)

# Use legitimate malware samples
# VirusTotal: https://www.virustotal.com/
# MalwareBazaar: https://bazaar.abuse.ch/
# TheZoo (research only): https://github.com/ytisf/theZoo

# Always follow ethical guidelines and legal frameworks