Windows Process Security: A Complete Guide

Managing and securing Windows processes is essential to protecting your system. This guide shows you how to monitor and protect processes effectively.

1. Process Management

Viewing Processes

# Display all processes
Get-Process

# Display processes with more details
Get-Process | Select-Object Id, ProcessName, CPU, WorkingSet64, Path

# Display processes by user
Get-Process | Group-Object UserName

Managing Processes

# Stop a process
Stop-Process -Name "ProcessName" -Force

# Suspend a process
Suspend-Process -Name "ProcessName"

# Resume a process
Resume-Process -Name "ProcessName"

2. Process Monitoring

Real-Time Monitoring

# Process monitoring script
function Monitor-Processes {
    param (
        [int]$Interval = 5
    )
    
    while ($true) {
        $processes = Get-Process | Where-Object {$_.CPU -gt 0}
        foreach ($process in $processes) {
            Write-Host "Processus: $($process.ProcessName) - CPU: $($process.CPU) - Mémoire: $($process.WorkingSet64/1MB) MB"
        }
        Start-Sleep -Seconds $Interval
    }
}

Anomaly Detection

# Anomaly detection script
function Detect-ProcessAnomalies {
    $baseline = @{
        "svchost.exe" = @(100, 200)  # Normal PID range
        "explorer.exe" = @(1000, 2000)
    }
    
    $current = Get-Process | Where-Object {$_.ProcessName -in $baseline.Keys}
    foreach ($proc in $current) {
        if ($proc.Id -lt $baseline[$proc.ProcessName][0] -or $proc.Id -gt $baseline[$proc.ProcessName][1]) {
            Write-Host "Anomalie détectée: $($proc.ProcessName) avec PID $($proc.Id)"
        }
    }
}

3. Malware Protection

Detecting Malicious Processes

# Malicious process detection script
function Detect-MaliciousProcesses {
    $suspiciousPatterns = @(
        "cryptominer",
        "miner",
        "botnet",
        "backdoor"
    )
    
    $processes = Get-Process
    foreach ($process in $processes) {
        foreach ($pattern in $suspiciousPatterns) {
            if ($process.ProcessName -match $pattern -or $process.Path -match $pattern) {
                Write-Host "Processus suspect détecté: $($process.ProcessName)"
            }
        }
    }
}

Protection Against Injection

# Injection protection configuration
$protectionSettings = @{
    "EnableLUA" = 1
    "EnableVirtualization" = 1
    "EnableInstallerDetection" = 1
}

foreach ($setting in $protectionSettings.GetEnumerator()) {
    Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" -Name $setting.Key -Value $setting.Value
}

4. Auditing and Logging

Audit Configuration

# Enable process auditing
auditpol /set /category:"Detailed Tracking" /success:enable /failure:enable

# Log configuration
wevtutil sl Security /maxsize:4294967296 /retention:true

Log Analysis

# Process log analysis script
function Analyze-ProcessLogs {
    $events = Get-EventLog -LogName Security -Source "Security" -After (Get-Date).AddHours(-24)
    $processEvents = $events | Where-Object {$_.EventID -eq 4688 -or $_.EventID -eq 4689}
    
    foreach ($event in $processEvents) {
        Write-Host "Événement processus: $($event.TimeGenerated) - $($event.Message)"
    }
}

5. Security Scripts

Security Check

# Process security check script
function Test-ProcessSecurity {
    $issues = @()
    
    # Check system processes
    $systemProcesses = Get-Process | Where-Object {$_.UserName -eq "NT AUTHORITY\SYSTEM"}
    foreach ($process in $systemProcesses) {
        if ($process.Path -notlike "C:\Windows\System32\*") {
            $issues += "Processus système suspect: $($process.ProcessName)"
        }
    }
    
    # Check permissions
    $sensitiveProcesses = @("lsass.exe", "services.exe")
    foreach ($process in $sensitiveProcesses) {
        $proc = Get-Process $process -ErrorAction SilentlyContinue
        if ($proc) {
            $acl = Get-Acl $proc.Path
            if (-not ($acl.Access | Where-Object {$_.IdentityReference -eq "NT AUTHORITY\SYSTEM"})) {
                $issues += "Permissions incorrectes sur $process"
            }
        }
    }
    
    return $issues
}

Automatic Maintenance

# Process maintenance script
function Update-ProcessSecurity {
    # Detect malicious processes
    Detect-MaliciousProcesses
    
    # Check for anomalies
    Detect-ProcessAnomalies
    
    # Security check
    $issues = Test-ProcessSecurity
    foreach ($issue in $issues) {
        Write-Host "Problème détecté : $issue"
    }
}

Conclusion

Securing Windows processes requires:

• Constant monitoring
• Rapid anomaly detection
• Protection against injection
• Accurate documentation

Key takeaways:

• Monitor processes in real time
• Detect malicious processes
• Protect against injection
• Maintain detailed logs
• Follow best practices