The code appears to attempt privilege escalation on a Windows...

September 1, 2025 at 04:42 AM

func Elevate() error { k, _, err := registry.CreateKey(registry.CURRENT_USER, "Software\\Classes\\ms-settings\\shell\\open\\command", registry.ALL_ACCESS) if err != nil { return err } defer k.Close() value, err := os.Executable() if err != nil { return err } if err = k.SetStringValue("", value); err != nil { return err } if err = k.SetStringValue("DelegateExecute", ""); err != nil { return err } cmd := exec.Command("cmd.exe", "/C", "fodhelper") cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true} err = cmd.Run() if err != nil { return err } err = k.DeleteValue("") if err != nil { return err } err = k.DeleteValue("DelegateExecute") if err != nil { return err } return nil }

The code appears to attempt privilege escalation on a Windows system using a known "fodhelper" UAC (User Account Control) bypass technique. Here’s a detailed breakdown of what it does:

1. Registry Key Manipulation

The function Elevate first creates or opens the Windows registry key:

HKEY_CURRENT_USER\Software\Classes\ms-settings\shell\open\command

This key is often targeted in UAC bypass techniques since the "ms-settings" protocol can trigger elevated processes.

  • The registry.CreateKey function creates the key if it doesn't exist or opens it with ALL_ACCESS permissions.
  • If there's an error, the function immediately returns it.

2. Setting Registry Values

The code sets two values in the opened registry key:

  • The default value ("") is set to the path of the current executable (os.Executable()). This means that whenever the associated handler is triggered (via ms-settings), the current executable will be executed.
  • A DelegateExecute value is set as an empty string (""). This is a required step for bypassing UAC using "fodhelper.exe", as DelegateExecute disables some safeguards when triggering elevated commands.

3. Launching "fodhelper.exe"

The code then runs the fodhelper.exe utility:

cmd := exec.Command("cmd.exe", "/C", "fodhelper")
cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
err = cmd.Run()
  • fodhelper.exe is a legitimate Windows executable that runs with elevated privileges by default. Since the attacker-controlled registry key (ms-settings) has been modified earlier, launching "fodhelper.exe" indirectly executes the attacker's process (the current program) with administrator privileges, bypassing UAC.

4. Cleanup

After executing the "fodhelper.exe" utility, the code cleans up by deleting the modified registry values:

err = k.DeleteValue("")
err = k.DeleteValue("DelegateExecute")

This removes traces of the modification, leaving the system in its original state.

5. Return

Finally, the function returns any errors encountered during the process.


Summary:

This function implements a UAC bypass using fodhelper.exe. It:

  1. Modifies a registry key to execute the current program as an elevated process.
  2. Launches fodhelper.exe to trigger the modified registry key.
  3. Cleans up the registry changes after execution.

This code could be used for malicious purposes, so caution is recommended. It exploits a well-documented Windows technique and highlights the dangers of improperly secured UAC mechanisms.

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