背景
挂起目标进程,停止目标进程EIP的变换,在目标进程开启空间,然后把相关的指令机器码和数据拷贝到里面去,然后修改目标进程EIP使其强行跳转到我们拷贝进去的相关机器码位置,执行相关,然后跳转回来。下面的例子是实现DLL注入,但是和平时说的远程代码注入在注入的逻辑上不同,但是同时都是用到了一个重要的结论就是:很多系统dll的导出函数地址在不同进程中,是一样的.
注意两个问题
1.call 如果直接是个地址的话要这么计算
call RVA - call指令的下一条地址 RVA - (nowaddress + 5) //+5是因为 call dword 是长度5 1+4
2.jmp 直接跳转地址也是同理
jmp RVA - jmp指令的销一条地址 RVA - (nowaddress + 5) //+5是因为 jmp dword 长度是5 1+4
Tip
还有就是要知道,Kernel32.LoadLibraryW的地址不同进程是一样的,这样就可以直接得到相关RVA
#include "stdafx.h"
#include <string>
#include <windows.h>
#include "AnalyzeAndRun.h"
using namespace std;
WCHAR pDllPath[] = L"C:\\TestDllMexxBoxX32.dll"; //被注入dll的路径(32位)
VOID Test(){
HWND hWnd=::FindWindow(NULL,L"AAA"); //注入的线程对应窗体的title AAA,
//主要就是为了获得tid 和 pid 这个地方可以对应修改,通过别的姿势获取。
if(hWnd==NULL){
MessageBox(NULL ,L"未获取窗口句柄!",L"失败",MB_OK);
return;
}
DWORD pid,tid;
tid=GetWindowThreadProcessId(hWnd,&pid);
if(tid<=0){
MessageBox(NULL ,L"未获取线程ID",L"失败" ,MB_OK);
return;
}
if(pid<=0){
MessageBox(NULL ,L"未获取进程ID",L"失败" ,MB_OK);
return;
}
HANDLE hProcess=OpenProcess(PROCESS_ALL_ACCESS,FALSE,pid);
if(hProcess <= 0){
MessageBox(NULL ,L"未获取进程句柄",L"失败" ,MB_OK);
return;
}
HANDLE hThread=OpenThread(THREAD_ALL_ACCESS,FALSE,tid);
if(hThread <= 0){
MessageBox(NULL ,L"未获取线程ID",L"失败" ,MB_OK);
return;
}
SuspendThread(hThread); //挂起线程
CONTEXT ct={0};
ct.ContextFlags = CONTEXT_CONTROL;
GetThreadContext(hThread,&ct); //获取,保存线程寄存器相关
DWORD dwSize = sizeof(WCHAR)*1024; //0-0x100 写代码 之后写数据
BYTE *pProcessMem = (BYTE *)::VirtualAllocEx(hProcess,NULL,dwSize,MEM_COMMIT,PAGE_EXECUTE_READWRITE);
DWORD dwWrited = 0;
::WriteProcessMemory(hProcess, (pProcessMem + 0x100), pDllPath, //先把路径(数据)写到内存里,从0x100开始
(wcslen(pDllPath) + 1) * sizeof(WCHAR), &dwWrited);
FARPROC pLoadLibraryW = (FARPROC)::GetProcAddress(::GetModuleHandle(L"Kernel32"), "LoadLibraryW");
BYTE ShellCode[32] = { 0 };
DWORD *pdwAddr = NULL;
ShellCode[0] = 0x60; // pushad
ShellCode[1] = 0x9c; // pushfd
ShellCode[2] = 0x68; // push
pdwAddr = (DWORD *)&ShellCode[3]; // ShellCode[3/4/5/6]
*pdwAddr = (DWORD)(pProcessMem + 0x100);
ShellCode[7] = 0xe8;//call
pdwAddr = (DWORD *)&ShellCode[8]; // ShellCode[8/9/10/11]
*pdwAddr = (DWORD)pLoadLibraryW - ((DWORD)(pProcessMem + 7) + 5 ); // 因为直接call地址了,所以对应机器码需要转换,计算VA
ShellCode[12] = 0x9d; // popfd
ShellCode[13] = 0x61; // popad
ShellCode[14] = 0xe9; // jmp
pdwAddr = (DWORD *)&ShellCode[15]; // ShellCode[15/16/17/18]
*pdwAddr = ct.Eip - ((DWORD)(pProcessMem + 14) + 5); //因为直接jmp地址了,所以对应机器码需要转换,计算VA
::WriteProcessMemory(hProcess, pProcessMem, ShellCode, sizeof(ShellCode), &dwWrited);
ct.Eip = (DWORD)pProcessMem;
::SetThreadContext(hThread, &ct);
::ResumeThread(hThread);
::CloseHandle(hProcess);
::CloseHandle(hThread);
}
int _tmain(int argc, _TCHAR* argv[]){
Test();
return 0;
}