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试用网上成品的禁用U盘的相关软件，发现使用固态硬盘改装的U盘以及手机等设备，无法被禁止，无奈下，自己使用C#手搓了一个。
基本逻辑：

• 开机自启；
• 启动时，修改注册表，禁止系统插入USB存储设备
• 监听系统的USB插入事件
  • 判断系统插入USB设备的类型；
  • 如果系统注册表被篡改，并插入非法设备，则立刻重启系统；

Demo1.0主要代码如下：

using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Management;
using System.Security.AccessControl;
using System.Security.Principal;
using System.ServiceProcess;namespace ListeningUSB
{partial class Service1 : ServiceBase{private string logFilePath;private ManagementEventWatcher watcher;public Service1(){InitializeComponent();logFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "secrecy.log");}protected override void OnStart(string[] args){// 重构注册表// 3：表示手动启动，通常用于设备驱动，即启用 USB 功能；// 4：表示禁用启动，此设置会禁用 USB 存储设备，插入 U 盘等设备时将无法使用；// 0：表示自动启动。string[] services = { "USBSTOR", "cdrom", "UASPStor", "WUDFWpdMtp", "WINUSB", "usbprint", "usbscan", "aicusbwifi", "RtlWlanu", "BTHUSB" };foreach (string item in services){string keyPath = $"SYSTEM\\CurrentControlSet\\Services\\{item}";int startValue = GetRegistryValue(keyPath);if (startValue != 4){SetUSBStorPermissions(keyPath, 4);}}StartListeningForUSBInsertion();}protected override void OnStop(){if (watcher != null){watcher.Stop();watcher.Dispose();}}private void StartListeningForUSBInsertion(){// 检查日志文件是否存在CheckAndCreateFile(logFilePath);string query = "SELECT * FROM __InstanceCreationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_USBControllerDevice'";watcher = new ManagementEventWatcher(new WqlEventQuery(query));watcher.EventArrived += new EventArrivedEventHandler(USBInserted);watcher.Start();WriteLog("-------------开始异常设备检测---------------");}private void USBInserted(object sender, EventArrivedEventArgs e){if (JudgeUSBStatus(out string deviceInfo)){WriteLog($"检测到异常 USB 设备插入,设备信息: {deviceInfo}");using (Process process = new Process()){process.StartInfo = startInfo;process.Start();}}}// 检查日志文件是否存在static void CheckAndCreateFile(string filePath){if (!File.Exists(filePath)){using (File.Create(filePath)) { }}}// 关机ProcessStartInfo startInfo = new ProcessStartInfo{FileName = "shutdown.exe",Arguments = "/s /f /t 0",UseShellExecute = false};private bool JudgeUSBStatus(out string deviceInfo){deviceInfo = string.Empty;var serviceList = new[] { "disk", "wudfwpdmtp", "usbstor", "cdrom", "uaspstor", "usbprint", "rtlwlanu", "aicusbwifi", "usbscan" };bool status = false;try{using (var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE 'USB%'")){var usbDevices = searcher.Get();foreach (ManagementObject usbDevice in usbDevices){var service = usbDevice["Service"]?.ToString().ToLower();if (service != null && serviceList.Contains(service)){status = true;deviceInfo =  usbDevice.ToString();break;}}}}catch (Exception ex){WriteLog($"Error: {ex.Message}");}return status;}private void WriteLog(string message){using (StreamWriter writer = new StreamWriter(logFilePath, true)){writer.WriteLine($"{DateTime.Now:yyyy-MM-dd HH:mm:ss}: {message}");}}static int GetRegistryValue(string keyPath){try{using (RegistryKey key = Registry.LocalMachine.OpenSubKey(keyPath)){if (key != null){object value = key.GetValue("Start");if (value is int){return (int)value;}}}}catch (Exception e){Console.WriteLine($"Error getting registry value: {e.Message}");}return -1;}static void SetUSBStorPermissions(string keyPath, int value){try{using (RegistryKey key = Registry.LocalMachine.OpenSubKey(keyPath, RegistryKeyPermissionCheck.ReadWriteSubTree)){if (key != null){// 获取当前注册表项的 ACL 信息RegistrySecurity securityDescriptor = key.GetAccessControl();RegistryAccessRule everyoneRule = new RegistryAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null),RegistryRights.FullControl,AccessControlType.Allow);securityDescriptor.AddAccessRule(everyoneRule);key.SetAccessControl(securityDescriptor);// 修改 USBSTOR 注册表项的 Start 值为 4key.SetValue("Start", value, RegistryValueKind.DWord);// 将 USBSTOR 注册表项权限设置为所有人仅可读securityDescriptor = key.GetAccessControl();securityDescriptor.RemoveAccessRuleSpecific(everyoneRule);key.SetAccessControl(securityDescriptor);}}}catch (Exception e){Console.WriteLine($"Error setting registry permissions: {e.Message}");}}}
}

打包后，软件约12KB，使用下面的CMD命令，将exe加入系统的开机自启即可；

# 加入开机自启服务
sc create secrecy  binPath= "C:\Windows\System32\secrecy.exe" displayname="secrecy" description="This is a service that monitors whether the system has inserted an abnormal USB device."
# 删除该服务
sc delete secrecy