Remove legacy AttackTracer repo content

src/OCSentinelCli/AttackScanner.cs

@@ -0,0 +1,477 @@
+using System.Diagnostics.Eventing.Reader;
+using System.Globalization;
+using System.Net;
+using System.Runtime.Versioning;
+using System.Text.RegularExpressions;
+
+namespace OCSentinelCli;
+
+[SupportedOSPlatform("windows")]
+internal sealed class AttackScanner
+{
+    private static readonly string[] DefaultFtpRoots =
+    [
+        @"C:\inetpub\logs\LogFiles",
+        @"D:\inetpub\logs\LogFiles"
+    ];
+
+    private static readonly string[] DefaultFileZillaRoots =
+    [
+        @"C:\Program Files (x86)\FileZilla Server\Logs",
+        @"D:\Program Files (x86)\FileZilla Server\Logs"
+    ];
+
+    public ScanResult Run(ScanOptions options)
+    {
+        DateTimeOffset startedAtUtc = DateTimeOffset.UtcNow;
+        ScannerConfiguration configuration = LoadConfiguration(options);
+        var attacks = new List<AttackEvent>();
+        var errors = new List<string>();
+        DateTimeOffset since = DateTimeOffset.Now.AddDays(-options.LookbackDays);
+
+        ScanWindowsLogons(attacks, errors, since);
+        ScanSqlLogons(attacks, errors, since);
+        ScanExchangeLogons(attacks, errors, since);
+        ScanIisFtpLogs(attacks, errors, since, configuration);
+        ScanFileZillaLogs(attacks, errors, since, configuration);
+
+        if (configuration.ExcludedIps.Count > 0)
+        {
+            attacks = attacks
+                .Where(attack => !configuration.ExcludedIps.Contains(attack.SourceIp, StringComparer.OrdinalIgnoreCase))
+                .ToList();
+        }
+
+        attacks.Sort(static (left, right) => left.Timestamp.CompareTo(right.Timestamp));
+
+        List<AggregatedAttack> topSources = attacks
+            .GroupBy(static attack => attack.SourceIp)
+            .Select(group => AggregatedAttack.FromGroup(group))
+            .OrderByDescending(static aggregate => aggregate.Count)
+            .ThenBy(static aggregate => aggregate.SourceIp, StringComparer.OrdinalIgnoreCase)
+            .Take(options.TopCount)
+            .ToList();
+
+        int uniqueIpCount = attacks.Select(static attack => attack.SourceIp).Distinct(StringComparer.OrdinalIgnoreCase).Count();
+        string baseAlertState = GetAlertState(attacks.Count, uniqueIpCount, configuration);
+        string baseAlertReason = GetAlertReason(attacks.Count, uniqueIpCount, configuration, baseAlertState);
+        VulnerabilityCorrelationSummary vulnerabilityCorrelation = string.IsNullOrWhiteSpace(options.VulnerabilityCsvPath)
+            ? VulnerabilityCorrelationSummary.Empty()
+            : VulnerabilityCorrelation.LoadForMachine(Environment.MachineName, options.VulnerabilityCsvPath, errors);
+        CorrelationAssessment correlationAssessment = VulnerabilityCorrelation.Assess(baseAlertState, attacks.Count, vulnerabilityCorrelation, configuration);
+        DateTimeOffset generatedAtLocal = DateTimeOffset.Now;
+        DateTimeOffset generatedAtUtc = DateTimeOffset.UtcNow;
+
+        return new ScanResult
+        {
+            SchemaVersion = "2.0",
+            MachineName = Environment.MachineName,
+            GeneratedAtLocal = generatedAtLocal,
+            GeneratedAtUtc = generatedAtUtc,
+            ClientVersion = BuildMetadata.Version,
+            LookbackDays = options.LookbackDays,
+            TotalEvents = attacks.Count,
+            UniqueIpCount = uniqueIpCount,
+            AlertState = correlationAssessment.FinalAlertState,
+            AlertReason = correlationAssessment.CorrelationReason == "No CVE correlation applied." ? baseAlertReason : correlationAssessment.CorrelationReason,
+            BaseAlertState = baseAlertState,
+            BaseAlertReason = baseAlertReason,
+            VulnerabilityCorrelation = vulnerabilityCorrelation,
+            Runtime = new ScanRuntimeMetadata
+            {
+                StartedAtUtc = startedAtUtc,
+                FinishedAtUtc = generatedAtUtc,
+                UploadAttempted = false
+            },
+            Events = attacks,
+            TopSources = topSources,
+            Errors = errors
+        };
+    }
+
+    private static ScannerConfiguration LoadConfiguration(ScanOptions options)
+    {
+        if (string.IsNullOrWhiteSpace(options.ConfigPath))
+        {
+            return new ScannerConfiguration();
+        }
+
+        return ScannerConfiguration.Load(options.ConfigPath);
+    }
+
+    private static void ScanWindowsLogons(List<AttackEvent> attacks, List<string> errors, DateTimeOffset since)
+    {
+        const string query = "*[System/EventID=4625]";
+        TryScanEventLog("Security", query, errors, eventRecord =>
+        {
+            if (!TryGetTimestamp(eventRecord, since, out DateTimeOffset timestamp))
+            {
+                return;
+            }
+
+            string ip = ReadProperty(eventRecord, 19);
+            if (string.IsNullOrWhiteSpace(ip) || ip == "-")
+            {
+                return;
+            }
+
+            AddAttack(attacks, new AttackEvent
+            {
+                Timestamp = timestamp,
+                SourceIp = ip,
+                Target = "Windows login",
+                Username = ReadProperty(eventRecord, 5, "[unknown]"),
+                Source = "Security",
+                InstanceId = 4625
+            });
+        });
+    }
+
+    private static void ScanSqlLogons(List<AttackEvent> attacks, List<string> errors, DateTimeOffset since)
+    {
+        const string query = "*[System/EventID=18456]";
+        TryScanEventLog("Application", query, errors, eventRecord =>
+        {
+            if (!TryGetTimestamp(eventRecord, since, out DateTimeOffset timestamp))
+            {
+                return;
+            }
+
+            string ip = ExtractIp(ReadProperty(eventRecord, 2));
+            if (string.IsNullOrWhiteSpace(ip))
+            {
+                return;
+            }
+
+            AddAttack(attacks, new AttackEvent
+            {
+                Timestamp = timestamp,
+                SourceIp = ip,
+                Target = "SQL Server",
+                Username = ReadProperty(eventRecord, 0, "[unknown]"),
+                Source = "Application",
+                InstanceId = 18456
+            });
+        });
+    }
+
+    private static void ScanExchangeLogons(List<AttackEvent> attacks, List<string> errors, DateTimeOffset since)
+    {
+        const string query = "*[System/EventID=1035]";
+        TryScanEventLog("Application", query, errors, eventRecord =>
+        {
+            if (!TryGetTimestamp(eventRecord, since, out DateTimeOffset timestamp))
+            {
+                return;
+            }
+
+            string ip = ReadProperty(eventRecord, 3);
+            if (string.IsNullOrWhiteSpace(ip) || ip.Length <= 4)
+            {
+                return;
+            }
+
+            AddAttack(attacks, new AttackEvent
+            {
+                Timestamp = timestamp,
+                SourceIp = ip,
+                Target = "Exchange",
+                Username = "[not logged]",
+                Source = "Application",
+                InstanceId = 1035
+            });
+        });
+    }
+
+    private static void ScanIisFtpLogs(List<AttackEvent> attacks, List<string> errors, DateTimeOffset since, ScannerConfiguration configuration)
+    {
+        IEnumerable<string> roots = configuration.FtpRoots.Count > 0 ? configuration.FtpRoots : DefaultFtpRoots;
+        foreach (string root in roots)
+        {
+            try
+            {
+                if (!Directory.Exists(root))
+                {
+                    continue;
+                }
+
+                foreach (string directory in Directory.GetDirectories(root, "FTP*"))
+                {
+                    foreach (string file in Directory.GetFiles(directory, "*.log"))
+                    {
+                        ParseIisFtpLogFile(file, attacks, errors, since);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                errors.Add($"FTP scan failed for {root}: {ex.Message}");
+            }
+        }
+    }
+
+    private static void ParseIisFtpLogFile(string filePath, List<AttackEvent> attacks, List<string> errors, DateTimeOffset since)
+    {
+        string username = "[unknown]";
+
+        try
+        {
+            foreach (string line in File.ReadLines(filePath))
+            {
+                if (string.IsNullOrWhiteSpace(line) || line.StartsWith('#'))
+                {
+                    continue;
+                }
+
+                string[] parts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+                if (parts.Length < 9)
+                {
+                    continue;
+                }
+
+                if (!DateTime.TryParse(
+                        $"{parts[0]} {parts[1]}",
+                        CultureInfo.InvariantCulture,
+                        DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal,
+                        out DateTime timestampUtc))
+                {
+                    continue;
+                }
+
+                var timestamp = new DateTimeOffset(timestampUtc).ToLocalTime();
+                if (timestamp < since)
+                {
+                    continue;
+                }
+
+                string sourceIp = parts[2];
+                string command = parts[6];
+                string parameter = parts[7];
+                string status = parts[8];
+
+                if (string.Equals(command, "USER", StringComparison.OrdinalIgnoreCase))
+                {
+                    username = parameter;
+                }
+                else if (string.Equals(command, "PASS", StringComparison.OrdinalIgnoreCase)
+                    && !string.Equals(status, "230", StringComparison.OrdinalIgnoreCase))
+                {
+                    AddAttack(attacks, new AttackEvent
+                    {
+                        Timestamp = timestamp,
+                        SourceIp = sourceIp,
+                        Target = "FTP login",
+                        Username = username,
+                        Source = "IIS FTP",
+                        InstanceId = -1
+                    });
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            errors.Add($"FTP log parse failed for {filePath}: {ex.Message}");
+        }
+    }
+
+    private static void ScanFileZillaLogs(List<AttackEvent> attacks, List<string> errors, DateTimeOffset since, ScannerConfiguration configuration)
+    {
+        IEnumerable<string> roots = configuration.FileZillaRoots.Count > 0 ? configuration.FileZillaRoots : DefaultFileZillaRoots;
+        foreach (string root in roots)
+        {
+            try
+            {
+                if (!Directory.Exists(root))
+                {
+                    continue;
+                }
+
+                foreach (string file in Directory.GetFiles(root, "*.log"))
+                {
+                    ParseFileZillaLogFile(file, attacks, errors, since);
+                }
+            }
+            catch (Exception ex)
+            {
+                errors.Add($"FileZilla scan failed for {root}: {ex.Message}");
+            }
+        }
+    }
+
+    private static void ParseFileZillaLogFile(string filePath, List<AttackEvent> attacks, List<string> errors, DateTimeOffset since)
+    {
+        string username = "[unknown]";
+
+        try
+        {
+            foreach (string line in File.ReadLines(filePath))
+            {
+                if (string.IsNullOrWhiteSpace(line))
+                {
+                    continue;
+                }
+
+                int closeParen = line.IndexOf(')');
+                if (closeParen < 0)
+                {
+                    continue;
+                }
+
+                string remainder = line[(closeParen + 1)..];
+                int dash = remainder.IndexOf('-');
+                if (dash < 0)
+                {
+                    continue;
+                }
+
+                string timestampText = remainder[..dash].Trim();
+                remainder = remainder[(dash + 1)..].TrimStart();
+
+                if (!DateTime.TryParse(timestampText, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime parsedTimestamp))
+                {
+                    continue;
+                }
+
+                DateTimeOffset timestamp = new(parsedTimestamp);
+                if (timestamp < since)
+                {
+                    continue;
+                }
+
+                if (remainder.Contains("(not logged in)", StringComparison.OrdinalIgnoreCase))
+                {
+                    int idx = remainder.IndexOf(')');
+                    if (idx >= 0 && idx + 1 < remainder.Length)
+                    {
+                        remainder = remainder[(idx + 1)..];
+                    }
+                }
+
+                int openIp = remainder.IndexOf('(');
+                int closeIp = remainder.IndexOf(')');
+                if (openIp < 0 || closeIp <= openIp)
+                {
+                    continue;
+                }
+
+                string ip = remainder[(openIp + 1)..closeIp].Trim();
+                string message = remainder[(closeIp + 1)..].Trim();
+
+                if (message.Contains("password incorrect", StringComparison.OrdinalIgnoreCase))
+                {
+                    AddAttack(attacks, new AttackEvent
+                    {
+                        Timestamp = timestamp,
+                        SourceIp = ip,
+                        Target = "FileZilla FTP login",
+                        Username = username,
+                        Source = "FileZilla",
+                        InstanceId = -1
+                    });
+                }
+                else if (message.Contains("> USER", StringComparison.OrdinalIgnoreCase))
+                {
+                    int userIndex = message.IndexOf("> USER", StringComparison.OrdinalIgnoreCase);
+                    username = message[(userIndex + 6)..].Trim();
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            errors.Add($"FileZilla log parse failed for {filePath}: {ex.Message}");
+        }
+    }
+
+    private static void TryScanEventLog(string logName, string query, List<string> errors, Action<EventRecord> processRecord)
+    {
+        try
+        {
+            using var reader = new EventLogReader(new EventLogQuery(logName, PathType.LogName, query));
+            for (EventRecord? eventRecord = reader.ReadEvent(); eventRecord != null; eventRecord = reader.ReadEvent())
+            {
+                using (eventRecord)
+                {
+                    processRecord(eventRecord);
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            errors.Add($"Event log scan failed for {logName} ({query}): {ex.Message}");
+        }
+    }
+
+    private static bool TryGetTimestamp(EventRecord eventRecord, DateTimeOffset since, out DateTimeOffset timestamp)
+    {
+        if (!eventRecord.TimeCreated.HasValue)
+        {
+            timestamp = default;
+            return false;
+        }
+
+        timestamp = new DateTimeOffset(eventRecord.TimeCreated.Value);
+        return timestamp >= since;
+    }
+
+    private static string ReadProperty(EventRecord eventRecord, int index, string fallback = "")
+    {
+        if (index < 0 || index >= eventRecord.Properties.Count)
+        {
+            return fallback;
+        }
+
+        object? value = eventRecord.Properties[index].Value;
+        return value?.ToString()?.Trim() ?? fallback;
+    }
+
+    private static void AddAttack(List<AttackEvent> attacks, AttackEvent attack)
+    {
+        if (string.IsNullOrWhiteSpace(attack.SourceIp))
+        {
+            return;
+        }
+
+        if (!LooksLikeIpAddress(attack.SourceIp))
+        {
+            return;
+        }
+
+        attacks.Add(attack with { SourceIp = attack.SourceIp.Trim() });
+    }
+
+    private static string ExtractIp(string input)
+    {
+        Match match = Regex.Match(input, @"\b(?:\d{1,3}\.){3}\d{1,3}\b");
+        return match.Success ? match.Value : string.Empty;
+    }
+
+    private static bool LooksLikeIpAddress(string input)
+    {
+        return IPAddress.TryParse(input, out _);
+    }
+
+    private static string GetAlertState(int totalEvents, int uniqueIpCount, ScannerConfiguration configuration)
+    {
+        if (totalEvents >= configuration.CriticalEventThreshold || uniqueIpCount >= configuration.CriticalUniqueIpThreshold)
+        {
+            return "critical";
+        }
+
+        if (totalEvents >= configuration.WarningEventThreshold || uniqueIpCount >= configuration.WarningUniqueIpThreshold)
+        {
+            return "warning";
+        }
+
+        return "ok";
+    }
+
+    private static string GetAlertReason(int totalEvents, int uniqueIpCount, ScannerConfiguration configuration, string alertState)
+    {
+        return alertState switch
+        {
+            "critical" => $"Critical threshold reached. Events={totalEvents}/{configuration.CriticalEventThreshold}, UniqueIPs={uniqueIpCount}/{configuration.CriticalUniqueIpThreshold}.",
+            "warning" => $"Warning threshold reached. Events={totalEvents}/{configuration.WarningEventThreshold}, UniqueIPs={uniqueIpCount}/{configuration.WarningUniqueIpThreshold}.",
+            _ => "No thresholds exceeded."
+        };
+    }
+}

src/OCSentinelCli/BuildMetadata.cs

@@ -0,0 +1,11 @@
+using System.Reflection;
+
+namespace OCSentinelCli;
+
+internal static class BuildMetadata
+{
+    public static string Version =>
+        Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion
+        ?? Assembly.GetExecutingAssembly().GetName().Version?.ToString()
+        ?? "0.0.0";
+}

src/OCSentinelCli/Commands/ScanAndUploadCommand.cs

@@ -0,0 +1,41 @@
+namespace OCSentinelCli.Commands;
+
+internal static class ScanAndUploadCommand
+{
+    public static int Execute(string[] args)
+    {
+        string outputPath = @"C:\ProgramData\OCSentinel\reports\latest.json";
+        bool hasOutput = false;
+
+        for (int i = 0; i < args.Length; i++)
+        {
+            if (string.Equals(args[i], "--output", StringComparison.OrdinalIgnoreCase) && i + 1 < args.Length)
+            {
+                outputPath = args[i + 1];
+                hasOutput = true;
+                break;
+            }
+        }
+
+        List<string> scanArgs = [.. args];
+        if (!hasOutput)
+        {
+            scanArgs.Add("--output");
+            scanArgs.Add(outputPath);
+        }
+
+        int scanExitCode = ScanCommand.Execute([.. scanArgs]);
+        if (scanExitCode != 0)
+        {
+            return scanExitCode;
+        }
+
+        var uploadArgs = new List<string>
+        {
+            "--report",
+            outputPath
+        };
+
+        return UploadCommand.Execute([.. uploadArgs]);
+    }
+}

src/OCSentinelCli/Commands/ScanCommand.cs

@@ -0,0 +1,138 @@
+using System.Text.Json;
+using System.Runtime.Versioning;
+
+namespace OCSentinelCli.Commands;
+
+[SupportedOSPlatform("windows")]
+internal static class ScanCommand
+{
+    public static int Execute(string[] args)
+    {
+        ScanOptions options;
+
+        try
+        {
+            options = ScanOptions.Parse(args);
+        }
+        catch (ArgumentException ex)
+        {
+            Console.Error.WriteLine(ex.Message);
+            Console.Error.WriteLine();
+            Console.Error.WriteLine(ScanOptions.Usage);
+            return 2;
+        }
+
+        if (options.ShowHelp)
+        {
+            Console.WriteLine(ScanOptions.Usage);
+            return 0;
+        }
+
+        try
+        {
+            var scanner = new AttackScanner();
+            ScanResult result = scanner.Run(options);
+            string json = JsonSerializer.Serialize(result, JsonOptions.Default);
+
+            if (!string.IsNullOrWhiteSpace(options.OutputPath))
+            {
+                string outputPath = Path.GetFullPath(options.OutputPath);
+                string? outputDirectory = Path.GetDirectoryName(outputPath);
+                if (!string.IsNullOrWhiteSpace(outputDirectory))
+                {
+                    Directory.CreateDirectory(outputDirectory);
+                }
+
+                File.WriteAllText(outputPath, json);
+            }
+
+            WriteConsoleOutput(result, options, json);
+
+            if (options.FailOnThreshold && !string.Equals(result.AlertState, "ok", StringComparison.OrdinalIgnoreCase))
+            {
+                return 1;
+            }
+
+            return options.FailOnAttacks && result.TotalEvents > 0 ? 1 : 0;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Scanner failed: {ex}");
+            return 1;
+        }
+    }
+
+    private static void WriteConsoleOutput(ScanResult result, ScanOptions options, string json)
+    {
+        if (!options.JsonOnly)
+        {
+            Console.WriteLine($"OfficeCom Sentinel summary for {result.MachineName}");
+            Console.WriteLine($"Generated: {result.GeneratedAtLocal:yyyy-MM-dd HH:mm:ss}");
+            Console.WriteLine($"Events: {result.TotalEvents}");
+            Console.WriteLine($"Unique IPs: {result.UniqueIpCount}");
+            Console.WriteLine($"Status: {result.AlertState}");
+            Console.WriteLine($"Reason: {result.AlertReason}");
+            Console.WriteLine($"Base status: {result.BaseAlertState}");
+            Console.WriteLine($"Scan errors: {result.Errors.Count}");
+            Console.WriteLine();
+
+            if (result.TopSources.Count == 0)
+            {
+                Console.WriteLine("No attacks found in the selected lookback window.");
+            }
+            else
+            {
+                Console.WriteLine("Top source IPs:");
+                for (int i = 0; i < result.TopSources.Count; i++)
+                {
+                    AggregatedAttack aggregate = result.TopSources[i];
+                    Console.WriteLine($"{i + 1}. {aggregate.SourceIp} | {aggregate.Count} hits | {aggregate.FirstSeenLocal:yyyy-MM-dd HH:mm:ss} -> {aggregate.LastSeenLocal:yyyy-MM-dd HH:mm:ss} | {aggregate.RateLabel}");
+                    Console.WriteLine($"   Targets: {string.Join(", ", aggregate.Targets)} | Users: {string.Join(", ", aggregate.Usernames)}");
+                }
+            }
+
+            if (result.VulnerabilityCorrelation.TotalCount > 0)
+            {
+                Console.WriteLine();
+                Console.WriteLine("Vulnerability correlation:");
+                Console.WriteLine($"CVE findings for this host: {result.VulnerabilityCorrelation.TotalCount}");
+                Console.WriteLine($"Critical/High findings: {result.VulnerabilityCorrelation.CriticalCount}");
+                Console.WriteLine($"CVSS >= 8 findings: {result.VulnerabilityCorrelation.HighCvssCount}");
+            }
+
+            if (!string.IsNullOrWhiteSpace(options.OutputPath))
+            {
+                Console.WriteLine();
+                Console.WriteLine($"JSON report written to {Path.GetFullPath(options.OutputPath)}");
+            }
+
+            if (result.Errors.Count > 0)
+            {
+                Console.WriteLine();
+                Console.WriteLine("Warnings:");
+                foreach (string error in result.Errors)
+                {
+                    Console.WriteLine($"- {error}");
+                }
+            }
+        }
+        else
+        {
+            Console.WriteLine(json);
+        }
+
+        if (options.NinjaOutput)
+        {
+            Console.WriteLine();
+            Console.WriteLine($"ATTACKTRACER_STATUS={result.AlertState}");
+            Console.WriteLine($"ATTACKTRACER_REASON={result.AlertReason}");
+            Console.WriteLine($"ATTACKTRACER_BASE_STATUS={result.BaseAlertState}");
+            Console.WriteLine($"ATTACKTRACER_EVENTS={result.TotalEvents}");
+            Console.WriteLine($"ATTACKTRACER_UNIQUE_IPS={result.UniqueIpCount}");
+            Console.WriteLine($"ATTACKTRACER_ERRORS={result.Errors.Count}");
+            Console.WriteLine($"ATTACKTRACER_CVE_TOTAL={result.VulnerabilityCorrelation.TotalCount}");
+            Console.WriteLine($"ATTACKTRACER_CVE_CRITICAL={result.VulnerabilityCorrelation.CriticalCount}");
+            Console.WriteLine($"ATTACKTRACER_CVE_HIGH_CVSS={result.VulnerabilityCorrelation.HighCvssCount}");
+        }
+    }
+}

src/OCSentinelCli/Commands/UploadCommand.cs

@@ -0,0 +1,100 @@
+using OCSentinelCli.Configuration;
+using System.Text.Json;
+using OCSentinelCli.Security;
+using OCSentinelCli.Transport;
+
+namespace OCSentinelCli.Commands;
+
+internal static class UploadCommand
+{
+    public static int Execute(string[] args)
+    {
+        string? reportPath = null;
+        string? configPath = null;
+        string? secretPath = null;
+
+        for (int i = 0; i < args.Length; i++)
+        {
+            switch (args[i])
+            {
+                case "--report":
+                    reportPath = ReadValue(args, ref i, "--report");
+                    break;
+                case "--client-config":
+                    configPath = ReadValue(args, ref i, "--client-config");
+                    break;
+                case "--secret-path":
+                    secretPath = ReadValue(args, ref i, "--secret-path");
+                    break;
+                case "--help":
+                case "-h":
+                    Console.WriteLine("Usage: OCSentinelCli upload --report <path> [--client-config <path>] [--secret-path <path>]");
+                    return 0;
+                default:
+                    throw new ArgumentException($"Unknown argument: {args[i]}");
+            }
+        }
+
+        if (string.IsNullOrWhiteSpace(reportPath))
+        {
+            throw new ArgumentException("Missing required argument: --report");
+        }
+
+        string resolvedConfigPath = Path.GetFullPath(configPath ?? @"C:\ProgramData\OCSentinel\config\ocsentinel-client.json");
+        string resolvedSecretPath = Path.GetFullPath(secretPath ?? @"C:\ProgramData\OCSentinel\secrets\ocsentinel-upload-secret.dat");
+        ClientConfiguration config = ClientConfiguration.Load(resolvedConfigPath);
+
+        if (string.IsNullOrWhiteSpace(config.N8nWebhookUrl))
+        {
+            throw new InvalidOperationException("Client configuration does not define n8nWebhookUrl.");
+        }
+
+        if (!File.Exists(resolvedSecretPath))
+        {
+            throw new FileNotFoundException($"Protected upload secret file not found: {resolvedSecretPath}");
+        }
+
+        string reportFullPath = Path.GetFullPath(reportPath);
+        string json = File.ReadAllText(reportFullPath);
+        ScanResult? parsedReport = JsonSerializer.Deserialize<ScanResult>(json, JsonOptions.Default);
+        if (parsedReport is not null)
+        {
+            parsedReport = parsedReport with
+            {
+                Runtime = parsedReport.Runtime with
+                {
+                    UploadAttempted = true
+                }
+            };
+
+            json = JsonSerializer.Serialize(parsedReport, JsonOptions.Default);
+            File.WriteAllText(reportFullPath, json);
+        }
+
+        string secret = ProtectedSecretStore.LoadSecret(resolvedSecretPath);
+        var client = new N8nUploadClient();
+        var result = client.UploadJson(config.N8nWebhookUrl, Environment.MachineName, BuildMetadata.Version, json, secret, config.UploadTimeoutSeconds);
+
+        if (!result.Success)
+        {
+            Console.Error.WriteLine($"Upload failed ({result.StatusCode}): {result.Message}");
+            return 1;
+        }
+
+        Console.WriteLine($"Upload succeeded ({result.StatusCode})");
+        Console.WriteLine($"Nonce: {result.Nonce}");
+        Console.WriteLine($"Payload SHA256: {result.PayloadSha256}");
+        return 0;
+    }
+
+    private static string ReadValue(string[] args, ref int index, string argName)
+    {
+        if (index + 1 >= args.Length)
+        {
+            throw new ArgumentException($"Missing value for {argName}");
+        }
+
+        index++;
+        return args[index];
+    }
+}

src/OCSentinelCli/Commands/VersionCommand.cs

@@ -0,0 +1,10 @@
+namespace OCSentinelCli.Commands;
+
+internal static class VersionCommand
+{
+    public static int Execute()
+    {
+        Console.WriteLine(BuildMetadata.Version);
+        return 0;
+    }
+}

src/OCSentinelCli/Configuration.cs

@@ -0,0 +1,32 @@
+using System.Text.Json;
+
+namespace OCSentinelCli;
+
+internal sealed record ScannerConfiguration
+{
+    public int WarningEventThreshold { get; init; } = 1;
+
+    public int CriticalEventThreshold { get; init; } = 20;
+
+    public int WarningUniqueIpThreshold { get; init; } = 1;
+
+    public int CriticalUniqueIpThreshold { get; init; } = 10;
+
+    public int CorrelationWarningCveThreshold { get; init; } = 1;
+
+    public int CorrelationCriticalCveThreshold { get; init; } = 1;
+
+    public List<string> FtpRoots { get; init; } = [];
+
+    public List<string> FileZillaRoots { get; init; } = [];
+
+    public List<string> ExcludedIps { get; init; } = [];
+
+    public static ScannerConfiguration Load(string path)
+    {
+        string fullPath = Path.GetFullPath(path);
+        string json = File.ReadAllText(fullPath);
+        ScannerConfiguration? config = JsonSerializer.Deserialize<ScannerConfiguration>(json, JsonOptions.Default);
+        return config ?? new ScannerConfiguration();
+    }
+}

src/OCSentinelCli/Configuration/ClientConfiguration.cs

@@ -0,0 +1,34 @@
+using System.Text.Json;
+
+namespace OCSentinelCli.Configuration;
+
+internal sealed record ClientConfiguration
+{
+    public string SchemaVersion { get; init; } = "2.0";
+
+    public string Environment { get; init; } = "production";
+
+    public int LookbackDays { get; init; } = 7;
+
+    public int TopFindings { get; init; } = 10;
+
+    public string N8nWebhookUrl { get; init; } = string.Empty;
+
+    public string DeviceIdentifierMode { get; init; } = "machineName";
+
+    public int UploadTimeoutSeconds { get; init; } = 30;
+
+    public bool EnableVulnerabilityCorrelation { get; init; } = true;
+
+    public string VulnerabilityCsvPath { get; init; } = string.Empty;
+
+    public string SecretReference { get; init; } = "device-default";
+
+    public static ClientConfiguration Load(string path)
+    {
+        string fullPath = Path.GetFullPath(path);
+        string json = File.ReadAllText(fullPath);
+        ClientConfiguration? config = JsonSerializer.Deserialize<ClientConfiguration>(json, JsonOptions.Default);
+        return config ?? new ClientConfiguration();
+    }
+}

src/OCSentinelCli/JsonOptions.cs

@@ -0,0 +1,13 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace OCSentinelCli;
+
+internal static class JsonOptions
+{
+    public static readonly JsonSerializerOptions Default = new()
+    {
+        WriteIndented = true,
+        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
+    };
+}

src/OCSentinelCli/Models.cs

@@ -0,0 +1,177 @@
+namespace OCSentinelCli;
+
+internal sealed record AttackEvent
+{
+    public DateTimeOffset Timestamp { get; init; }
+
+    public string SourceIp { get; init; } = string.Empty;
+
+    public long InstanceId { get; init; }
+
+    public string Target { get; init; } = string.Empty;
+
+    public string Username { get; init; } = string.Empty;
+
+    public string Source { get; init; } = string.Empty;
+}
+
+internal sealed record AggregatedAttack
+{
+    public string SourceIp { get; init; } = string.Empty;
+
+    public int Count { get; init; }
+
+    public DateTimeOffset FirstSeenLocal { get; init; }
+
+    public DateTimeOffset LastSeenLocal { get; init; }
+
+    public string RateLabel { get; init; } = string.Empty;
+
+    public List<string> Targets { get; init; } = [];
+
+    public List<string> Usernames { get; init; } = [];
+
+    public List<string> Sources { get; init; } = [];
+
+    public static AggregatedAttack FromGroup(IGrouping<string, AttackEvent> group)
+    {
+        List<AttackEvent> ordered = group.OrderBy(static attack => attack.Timestamp).ToList();
+        DateTimeOffset firstSeen = ordered[0].Timestamp;
+        DateTimeOffset lastSeen = ordered[^1].Timestamp;
+
+        return new AggregatedAttack
+        {
+            SourceIp = group.Key,
+            Count = ordered.Count,
+            FirstSeenLocal = firstSeen,
+            LastSeenLocal = lastSeen,
+            RateLabel = FormatRate(ordered.Count, firstSeen, lastSeen),
+            Targets = ordered.Select(static attack => attack.Target).Distinct(StringComparer.OrdinalIgnoreCase).Order().ToList(),
+            Usernames = ordered.Select(static attack => attack.Username).Distinct(StringComparer.OrdinalIgnoreCase).Order().ToList(),
+            Sources = ordered.Select(static attack => attack.Source).Distinct(StringComparer.OrdinalIgnoreCase).Order().ToList()
+        };
+    }
+
+    private static string FormatRate(int count, DateTimeOffset firstSeen, DateTimeOffset lastSeen)
+    {
+        int seconds = (int)Math.Max(1, (lastSeen - firstSeen).TotalSeconds);
+        if (seconds <= 1)
+        {
+            return $"{count * 60}/min";
+        }
+
+        if (seconds <= 60)
+        {
+            return $"{count * 60 / seconds}/min";
+        }
+
+        if (seconds <= 3600)
+        {
+            return $"{count * 3600 / seconds}/hour";
+        }
+
+        return $"{count * 86400 / seconds}/day";
+    }
+}
+
+internal sealed record ScanResult
+{
+    public string SchemaVersion { get; init; } = "2.0";
+
+    public string MachineName { get; init; } = string.Empty;
+
+    public DateTimeOffset GeneratedAtLocal { get; init; }
+
+    public DateTimeOffset GeneratedAtUtc { get; init; }
+
+    public string ClientVersion { get; init; } = string.Empty;
+
+    public int LookbackDays { get; init; }
+
+    public int TotalEvents { get; init; }
+
+    public int UniqueIpCount { get; init; }
+
+    public string AlertState { get; init; } = "ok";
+
+    public string AlertReason { get; init; } = "No thresholds exceeded.";
+
+    public string BaseAlertState { get; init; } = "ok";
+
+    public string BaseAlertReason { get; init; } = "No thresholds exceeded.";
+
+    public VulnerabilityCorrelationSummary VulnerabilityCorrelation { get; init; } = new();
+
+    public ScanRuntimeMetadata Runtime { get; init; } = new();
+
+    public List<AttackEvent> Events { get; init; } = [];
+
+    public List<AggregatedAttack> TopSources { get; init; } = [];
+
+    public List<string> Errors { get; init; } = [];
+}
+
+internal sealed record ScanRuntimeMetadata
+{
+    public DateTimeOffset StartedAtUtc { get; init; }
+
+    public DateTimeOffset FinishedAtUtc { get; init; }
+
+    public bool UploadAttempted { get; init; }
+}
+
+internal sealed record VulnerabilityFinding
+{
+    public string DeviceName { get; init; } = string.Empty;
+
+    public string CveId { get; init; } = string.Empty;
+
+    public string Severity { get; init; } = string.Empty;
+
+    public double? CvssScore { get; init; }
+
+    public string Remediation { get; init; } = string.Empty;
+}
+
+internal sealed record VulnerabilityCorrelationSummary
+{
+    public string SourcePath { get; init; } = string.Empty;
+
+    public int TotalCount { get; init; }
+
+    public int CriticalCount { get; init; }
+
+    public int HighCvssCount { get; init; }
+
+    public List<VulnerabilityFinding> Findings { get; init; } = [];
+
+    public static VulnerabilityCorrelationSummary Empty(string sourcePath = "")
+    {
+        return new VulnerabilityCorrelationSummary { SourcePath = sourcePath };
+    }
+
+    public static VulnerabilityCorrelationSummary FromFindings(string sourcePath, List<VulnerabilityFinding> findings)
+    {
+        int criticalCount = findings.Count(f =>
+            string.Equals(f.Severity, "critical", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(f.Severity, "high", StringComparison.OrdinalIgnoreCase));
+
+        int highCvssCount = findings.Count(f => f.CvssScore.HasValue && f.CvssScore.Value >= 8.0);
+
+        return new VulnerabilityCorrelationSummary
+        {
+            SourcePath = sourcePath,
+            TotalCount = findings.Count,
+            CriticalCount = criticalCount,
+            HighCvssCount = highCvssCount,
+            Findings = findings
+        };
+    }
+}
+
+internal sealed record CorrelationAssessment
+{
+    public string FinalAlertState { get; init; } = "ok";
+
+    public string CorrelationReason { get; init; } = "No CVE correlation applied.";
+}

src/OCSentinelCli/Models/UploadResult.cs

@@ -0,0 +1,14 @@
+namespace OCSentinelCli.Models;
+
+internal sealed record UploadResult
+{
+    public bool Success { get; init; }
+
+    public int StatusCode { get; init; }
+
+    public string Message { get; init; } = string.Empty;
+
+    public string Nonce { get; init; } = string.Empty;
+
+    public string PayloadSha256 { get; init; } = string.Empty;
+}

src/OCSentinelCli/OCSentinelCli.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AssemblyName>OCSentinelCli</AssemblyName>
+    <RootNamespace>OCSentinelCli</RootNamespace>
+    <Product>OfficeCom Sentinel</Product>
+    <Company>OfficeCom</Company>
+    <Version>1.2.3</Version>
+    <AssemblyVersion>1.2.3.0</AssemblyVersion>
+    <FileVersion>1.2.3.0</FileVersion>
+    <InformationalVersion>1.2.3</InformationalVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Diagnostics.EventLog" Version="10.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="10.0.0" />
+  </ItemGroup>
+
+</Project>

src/OCSentinelCli/Program.cs

@@ -0,0 +1,37 @@
+using System.Runtime.Versioning;
+using OCSentinelCli.Commands;
+
+namespace OCSentinelCli;
+
+[SupportedOSPlatform("windows")]
+internal static class Program
+{
+    private static int Main(string[] args)
+    {
+        try
+        {
+            if (args.Length == 0)
+            {
+                return ScanCommand.Execute(args);
+            }
+
+            string command = args[0];
+            string[] remainingArgs = args[1..];
+
+            return command switch
+            {
+                "scan" => ScanCommand.Execute(remainingArgs),
+                "upload" => UploadCommand.Execute(remainingArgs),
+                "scan-and-upload" => ScanAndUploadCommand.Execute(remainingArgs),
+                "version" => VersionCommand.Execute(),
+                _ when command.StartsWith('-') || command.StartsWith('/') => ScanCommand.Execute(args),
+                _ => ScanCommand.Execute(args)
+            };
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Command failed: {ex}");
+            return 1;
+        }
+    }
+}

src/OCSentinelCli/ScanOptions.cs

@@ -0,0 +1,113 @@
+namespace OCSentinelCli;
+
+internal sealed record ScanOptions
+{
+    public const string Usage = """
+Usage:
+  OCSentinelCli [--output <path>] [--lookback-days <n>] [--top <n>] [--config <path>] [--vulnerability-csv <path>] [--json-only] [--ninja-output] [--fail-on-attacks] [--fail-on-threshold] [--help]
+
+Options:
+  --output <path>         Write the JSON report to the given file.
+  --lookback-days <n>     Only include events newer than now minus n days. Default: 30
+  --top <n>               Number of aggregated source IPs to show. Default: 10
+  --config <path>         Load thresholds, path overrides, and exclusions from JSON.
+  --vulnerability-csv <path>
+                           Correlate local attack results with exported CVE data for this host.
+  --json-only             Print only JSON to stdout.
+  --ninja-output          Print extra key=value lines for RMM/Ninja-style parsing.
+  --fail-on-attacks       Return exit code 1 when attacks are found.
+  --fail-on-threshold     Return exit code 1 when status is warning or critical.
+  --help                  Show this message.
+""";
+
+    public string? OutputPath { get; init; }
+
+    public int LookbackDays { get; init; } = 30;
+
+    public int TopCount { get; init; } = 10;
+
+    public bool JsonOnly { get; init; }
+
+    public bool NinjaOutput { get; init; }
+
+    public bool FailOnAttacks { get; init; }
+
+    public bool FailOnThreshold { get; init; }
+
+    public string? ConfigPath { get; init; }
+
+    public string? VulnerabilityCsvPath { get; init; }
+
+    public bool ShowHelp { get; init; }
+
+    public static ScanOptions Parse(string[] args)
+    {
+        var options = new ScanOptions();
+
+        for (int i = 0; i < args.Length; i++)
+        {
+            string arg = args[i];
+            switch (arg)
+            {
+                case "--help":
+                case "-h":
+                case "/?":
+                    options = options with { ShowHelp = true };
+                    break;
+                case "--json-only":
+                    options = options with { JsonOnly = true };
+                    break;
+                case "--ninja-output":
+                    options = options with { NinjaOutput = true };
+                    break;
+                case "--fail-on-attacks":
+                    options = options with { FailOnAttacks = true };
+                    break;
+                case "--fail-on-threshold":
+                    options = options with { FailOnThreshold = true };
+                    break;
+                case "--output":
+                    options = options with { OutputPath = ReadValue(args, ref i, arg) };
+                    break;
+                case "--config":
+                    options = options with { ConfigPath = ReadValue(args, ref i, arg) };
+                    break;
+                case "--vulnerability-csv":
+                    options = options with { VulnerabilityCsvPath = ReadValue(args, ref i, arg) };
+                    break;
+                case "--lookback-days":
+                    options = options with { LookbackDays = ReadPositiveInt(args, ref i, arg) };
+                    break;
+                case "--top":
+                    options = options with { TopCount = ReadPositiveInt(args, ref i, arg) };
+                    break;
+                default:
+                    throw new ArgumentException($"Unknown argument: {arg}");
+            }
+        }
+
+        return options;
+    }
+
+    private static string ReadValue(string[] args, ref int index, string argName)
+    {
+        if (index + 1 >= args.Length)
+        {
+            throw new ArgumentException($"Missing value for {argName}");
+        }
+
+        index++;
+        return args[index];
+    }
+
+    private static int ReadPositiveInt(string[] args, ref int index, string argName)
+    {
+        string raw = ReadValue(args, ref index, argName);
+        if (!int.TryParse(raw, out int value) || value <= 0)
+        {
+            throw new ArgumentException($"{argName} must be a positive integer");
+        }
+
+        return value;
+    }
+}

src/OCSentinelCli/Security/ProtectedSecretStore.cs

@@ -0,0 +1,28 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace OCSentinelCli.Security;
+
+internal static class ProtectedSecretStore
+{
+    public static string LoadSecret(string path)
+    {
+        byte[] protectedBytes = File.ReadAllBytes(path);
+        byte[] plainBytes = ProtectedData.Unprotect(protectedBytes, null, DataProtectionScope.LocalMachine);
+        return Encoding.UTF8.GetString(plainBytes);
+    }
+
+    public static void SaveSecret(string path, string secret)
+    {
+        string fullPath = Path.GetFullPath(path);
+        string? directory = Path.GetDirectoryName(fullPath);
+        if (!string.IsNullOrWhiteSpace(directory))
+        {
+            Directory.CreateDirectory(directory);
+        }
+
+        byte[] plainBytes = Encoding.UTF8.GetBytes(secret);
+        byte[] protectedBytes = ProtectedData.Protect(plainBytes, null, DataProtectionScope.LocalMachine);
+        File.WriteAllBytes(fullPath, protectedBytes);
+    }
+}

src/OCSentinelCli/Transport/N8nUploadClient.cs

@@ -0,0 +1,70 @@
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using OCSentinelCli.Models;
+
+namespace OCSentinelCli.Transport;
+
+internal sealed class N8nUploadClient
+{
+    public UploadResult UploadJson(
+        string webhookUrl,
+        string machineName,
+        string clientVersion,
+        string payloadJson,
+        string sharedSecret,
+        int timeoutSeconds)
+    {
+        string timestamp = DateTimeOffset.UtcNow.ToString("O");
+        string nonce = Guid.NewGuid().ToString("N");
+        string payloadHash = ComputeSha256(payloadJson);
+        string signature = ComputeSignature(machineName, timestamp, nonce, clientVersion, payloadHash, sharedSecret);
+
+        using var httpClient = new HttpClient
+        {
+            Timeout = TimeSpan.FromSeconds(Math.Max(5, timeoutSeconds))
+        };
+
+        using var request = new HttpRequestMessage(HttpMethod.Post, webhookUrl)
+        {
+            Content = new StringContent(payloadJson, Encoding.UTF8, "application/json")
+        };
+
+        request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        request.Headers.Add("X-ATN-Device", machineName);
+        request.Headers.Add("X-ATN-Timestamp", timestamp);
+        request.Headers.Add("X-ATN-Nonce", nonce);
+        request.Headers.Add("X-ATN-Version", clientVersion);
+        request.Headers.Add("X-ATN-Payload-SHA256", payloadHash);
+        request.Headers.Add("X-ATN-Signature", signature);
+
+        using HttpResponseMessage response = httpClient.Send(request);
+        string responseText = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
+
+        return new UploadResult
+        {
+            Success = response.IsSuccessStatusCode,
+            StatusCode = (int)response.StatusCode,
+            Message = string.IsNullOrWhiteSpace(responseText) ? response.ReasonPhrase ?? string.Empty : responseText,
+            Nonce = nonce,
+            PayloadSha256 = payloadHash
+        };
+    }
+
+    private static string ComputeSha256(string value)
+    {
+        byte[] bytes = Encoding.UTF8.GetBytes(value);
+        byte[] hash = SHA256.HashData(bytes);
+        return Convert.ToHexString(hash).ToLowerInvariant();
+    }
+
+    private static string ComputeSignature(string machineName, string timestamp, string nonce, string version, string payloadHash, string sharedSecret)
+    {
+        string canonical = string.Join("\n", machineName, timestamp, nonce, version, payloadHash);
+        byte[] secretBytes = Encoding.UTF8.GetBytes(sharedSecret);
+        byte[] canonicalBytes = Encoding.UTF8.GetBytes(canonical);
+        using var hmac = new HMACSHA256(secretBytes);
+        byte[] hash = hmac.ComputeHash(canonicalBytes);
+        return Convert.ToHexString(hash).ToLowerInvariant();
+    }
+}

src/OCSentinelCli/VulnerabilityCorrelation.cs

@@ -0,0 +1,200 @@
+using System.Globalization;
+
+namespace OCSentinelCli;
+
+internal static class VulnerabilityCorrelation
+{
+    private static readonly string[] DeviceNameHeaders = ["device", "device_name", "hostname", "computer", "computername", "endpoint", "machine", "system"];
+    private static readonly string[] CveHeaders = ["cve", "cve_id", "cveid", "vulnerability", "vulnerability_id"];
+    private static readonly string[] SeverityHeaders = ["severity", "risk", "level"];
+    private static readonly string[] CvssHeaders = ["cvss", "cvss_score", "score", "base_score"];
+    private static readonly string[] RemediationHeaders = ["remediation", "patch", "kb", "fix", "solution"];
+
+    public static VulnerabilityCorrelationSummary LoadForMachine(string machineName, string csvPath, List<string> errors)
+    {
+        try
+        {
+            string fullPath = Path.GetFullPath(csvPath);
+            if (!File.Exists(fullPath))
+            {
+                errors.Add($"Vulnerability correlation file not found: {fullPath}");
+                return VulnerabilityCorrelationSummary.Empty(fullPath);
+            }
+
+            string[] lines = File.ReadAllLines(fullPath);
+            if (lines.Length == 0)
+            {
+                return VulnerabilityCorrelationSummary.Empty(fullPath);
+            }
+
+            string[] headers = SplitCsvLine(lines[0]);
+            var headerMap = headers
+                .Select((header, index) => new { Header = header.Trim(), Index = index })
+                .ToDictionary(static pair => Normalize(pair.Header), static pair => pair.Index, StringComparer.OrdinalIgnoreCase);
+
+            int deviceIndex = FindHeaderIndex(headerMap, DeviceNameHeaders);
+            int cveIndex = FindHeaderIndex(headerMap, CveHeaders);
+            int severityIndex = FindHeaderIndex(headerMap, SeverityHeaders);
+            int cvssIndex = FindHeaderIndex(headerMap, CvssHeaders);
+            int remediationIndex = FindHeaderIndex(headerMap, RemediationHeaders);
+
+            if (deviceIndex < 0 || cveIndex < 0)
+            {
+                errors.Add($"Vulnerability correlation file is missing a device or CVE column: {fullPath}");
+                return VulnerabilityCorrelationSummary.Empty(fullPath);
+            }
+
+            var findings = new List<VulnerabilityFinding>();
+            for (int i = 1; i < lines.Length; i++)
+            {
+                string line = lines[i];
+                if (string.IsNullOrWhiteSpace(line))
+                {
+                    continue;
+                }
+
+                string[] cells = SplitCsvLine(line);
+                string deviceName = GetCell(cells, deviceIndex);
+                if (!string.Equals(deviceName, machineName, StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                string cveId = GetCell(cells, cveIndex);
+                if (string.IsNullOrWhiteSpace(cveId))
+                {
+                    continue;
+                }
+
+                string severity = severityIndex >= 0 ? GetCell(cells, severityIndex) : string.Empty;
+                string remediation = remediationIndex >= 0 ? GetCell(cells, remediationIndex) : string.Empty;
+                double? cvss = TryParseDouble(cvssIndex >= 0 ? GetCell(cells, cvssIndex) : string.Empty);
+
+                findings.Add(new VulnerabilityFinding
+                {
+                    DeviceName = deviceName,
+                    CveId = cveId,
+                    Severity = severity,
+                    CvssScore = cvss,
+                    Remediation = remediation
+                });
+            }
+
+            return VulnerabilityCorrelationSummary.FromFindings(fullPath, findings);
+        }
+        catch (Exception ex)
+        {
+            errors.Add($"Vulnerability correlation load failed for {csvPath}: {ex.Message}");
+            return VulnerabilityCorrelationSummary.Empty(Path.GetFullPath(csvPath));
+        }
+    }
+
+    public static CorrelationAssessment Assess(
+        string currentAlertState,
+        int totalEvents,
+        VulnerabilityCorrelationSummary vulnerabilitySummary,
+        ScannerConfiguration configuration)
+    {
+        string finalState = currentAlertState;
+        string reason = "No CVE correlation applied.";
+
+        bool hasAttacks = totalEvents > 0;
+        bool hasCriticalCvEs = vulnerabilitySummary.CriticalCount >= configuration.CorrelationCriticalCveThreshold;
+        bool hasWarningCvEs = vulnerabilitySummary.TotalCount >= configuration.CorrelationWarningCveThreshold;
+
+        if (hasAttacks && hasCriticalCvEs)
+        {
+            finalState = "critical";
+            reason = $"Attack activity correlated with {vulnerabilitySummary.CriticalCount} critical/high CVE findings on this endpoint.";
+        }
+        else if (hasAttacks && hasWarningCvEs && string.Equals(finalState, "ok", StringComparison.OrdinalIgnoreCase))
+        {
+            finalState = "warning";
+            reason = $"Attack activity correlated with {vulnerabilitySummary.TotalCount} CVE findings on this endpoint.";
+        }
+        else if (vulnerabilitySummary.TotalCount > 0)
+        {
+            reason = $"Loaded {vulnerabilitySummary.TotalCount} CVE findings for this endpoint, but no alert escalation was required.";
+        }
+
+        return new CorrelationAssessment
+        {
+            FinalAlertState = finalState,
+            CorrelationReason = reason
+        };
+    }
+
+    private static int FindHeaderIndex(Dictionary<string, int> headerMap, string[] candidates)
+    {
+        foreach (string candidate in candidates)
+        {
+            if (headerMap.TryGetValue(Normalize(candidate), out int index))
+            {
+                return index;
+            }
+        }
+
+        return -1;
+    }
+
+    private static string Normalize(string value)
+    {
+        return value.Trim().Replace(" ", "_").Replace("-", "_").ToLowerInvariant();
+    }
+
+    private static string[] SplitCsvLine(string line)
+    {
+        var result = new List<string>();
+        var current = new System.Text.StringBuilder();
+        bool inQuotes = false;
+
+        for (int i = 0; i < line.Length; i++)
+        {
+            char c = line[i];
+            if (c == '"')
+            {
+                if (inQuotes && i + 1 < line.Length && line[i + 1] == '"')
+                {
+                    current.Append('"');
+                    i++;
+                }
+                else
+                {
+                    inQuotes = !inQuotes;
+                }
+            }
+            else if (c == ',' && !inQuotes)
+            {
+                result.Add(current.ToString());
+                current.Clear();
+            }
+            else
+            {
+                current.Append(c);
+            }
+        }
+
+        result.Add(current.ToString());
+        return [.. result];
+    }
+
+    private static string GetCell(string[] cells, int index)
+    {
+        return index >= 0 && index < cells.Length ? cells[index].Trim() : string.Empty;
+    }
+
+    private static double? TryParseDouble(string value)
+    {
+        if (double.TryParse(value, NumberStyles.Any, CultureInfo.InvariantCulture, out double result))
+        {
+            return result;
+        }
+
+        if (double.TryParse(value, NumberStyles.Any, CultureInfo.CurrentCulture, out result))
+        {
+            return result;
+        }
+
+        return null;
+    }
+}