Fixed C# exe failing generation when set to PowerShell (#767)

CHANGELOG.md

@@ -14,6 +14,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+-   Fixed issue with C# exe and shellcode not compiling PowerShell stagers
 -   Fix delay/jitter adjustment in python agent (@janit0rjoe)
 
 ## [5.12.1] - 2025-01-08

empire/server/server.py

@@ -86,6 +86,10 @@ def reset():
         f"{CSHARP_DIR_BASE}/Data/Tasks/CSharp/Compiled/netcoreapp3.0"
     )
 
+    file_util.clear_file_contents(
+        f"{CSHARP_DIR_BASE}/Data/EmbeddedResources/launcher.txt"
+    )
+
     if os.path.exists(empire_config.starkiller.directory):
         shutil.rmtree(empire_config.starkiller.directory)
 

empire/server/stagers/CSharpPS.yaml

@@ -20,35 +20,34 @@
     using System.Management.Automation.Runspaces;
     using System.IO;
     using System.Reflection;
-    
+
     public static class Program
     {
-          public static void Main(string[] args)
-          {
-
-            PowerShell ps = PowerShell.Create();
+      public static void Main(string[] args)
+      {
 
-            try
-            {
-              var assembly = Assembly.GetExecutingAssembly();
-              var resourceName = "launcher.txt";
+        PowerShell ps = PowerShell.Create();
 
-              string[] names = assembly.GetManifestResourceNames();
+        try
+        {
+          var assembly = Assembly.GetExecutingAssembly();
+          var resourceName = "launcher.txt";
 
-              using (StreamReader reader = new StreamReader(assembly.GetManifestResourceStream(resourceName)))
-              {
-                  string script = reader.ReadToEnd();
-                  ps.AddScript(script);
-              }
-              ps.Invoke();
-    
-            }
-            catch (Exception e)
-            {
-                Console.WriteLine("Error: " + e.Message.ToString());
-            }
+          string[] names = assembly.GetManifestResourceNames();
 
+          using (StreamReader reader = new StreamReader(assembly.GetManifestResourceStream(resourceName)))
+          {
+            string script = reader.ReadToEnd();
+            ps.AddScript(script);
           }
+          ps.Invoke();
+
+        }
+        catch (Exception e)
+        {
+          Console.WriteLine("Error: " + e.Message.ToString());
+        }
+      }
     }
   TaskingType: Assembly
   UnsafeCompile: false

empire/server/utils/file_util.py

@@ -28,6 +28,19 @@ def remove_file(path: str) -> None:
         os.remove(path)
 
 
+def clear_file_contents(path: str) -> None:
+    """
+    Clears the contents of a file without deleting it.
+    If the file doesn't exist, it creates an empty file.
+    """
+    try:
+        with open(path, "w"):
+            pass
+        log.debug(f"Cleared contents of the file: {path}")
+    except Exception as e:
+        log.error(f"Failed to clear file contents for {path}: {e}", exc_info=True)
+
+
 def run_as_user(command, user=None, cwd=None):
     """
     Runs a command as a specified user or the user who invoked sudo.