第二十八章，利用汇编指令，注入代码

这里我们生成CodeInjection2.exe文件，通过文件将汇编语言插入notepad：

代码：

// CodeInjection2.cpp  
// reversecore@gmail.com  
// http://www.reversecore.com  

#include "windows.h"  
#include "stdio.h"  

typedef struct _THREAD_PARAM
{
    FARPROC pFunc[2];               // LoadLibraryA(), GetProcAddress()  
} THREAD_PARAM, * PTHREAD_PARAM;

BYTE g_InjectionCode[] =
{
    0x55, 0x8B, 0xEC, 0x8B, 0x75, 0x08, 0x68, 0x6C, 0x6C, 0x00,
    0x00, 0x68, 0x33, 0x32, 0x2E, 0x64, 0x68, 0x75, 0x73, 0x65,
    0x72, 0x54, 0xFF, 0x16, 0x68, 0x6F, 0x78, 0x41, 0x00, 0x68,
    0x61, 0x67, 0x65, 0x42, 0x68, 0x4D, 0x65, 0x73, 0x73, 0x54,
    0x50, 0xFF, 0x56, 0x04, 0x6A, 0x00, 0xE8, 0x0C, 0x00, 0x00,
    0x00, 0x52, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x43, 0x6F,
    0x72, 0x65, 0x00, 0xE8, 0x14, 0x00, 0x00, 0x00, 0x77, 0x77,
    0x77, 0x2E, 0x72, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x63,
    0x6F, 0x72, 0x65, 0x2E, 0x63, 0x6F, 0x6D, 0x00, 0x6A, 0x00,
    0xFF, 0xD0, 0x33, 0xC0, 0x8B, 0xE5, 0x5D, 0xC3
};

/*
004010ED    55               PUSH EBP
004010EE    8BEC             MOV EBP,ESP
004010F0    8B75 08          MOV ESI,DWORD PTR SS:[EBP+8]       ; ESI = pParam
004010F3    68 6C6C0000      PUSH 6C6C
004010F8    68 33322E64      PUSH 642E3233
004010FD    68 75736572      PUSH 72657375
00401102    54               PUSH ESP                           ; - "user32.dll"
00401103    FF16             CALL DWORD PTR DS:[ESI]            ; LoadLibraryA("user32.dll")
00401105    68 6F784100      PUSH 41786F
0040110A    68 61676542      PUSH 42656761
0040110F    68 4D657373      PUSH 7373654D
00401114    54               PUSH ESP                           ; - "MessageBoxA"
00401115    50               PUSH EAX                           ; - hMod
00401116    FF56 04          CALL DWORD PTR DS:[ESI+4]          ; GetProcAddress(hMod, "MessageBoxA")
00401119    6A 00            PUSH 0                             ; - MB_OK (0)
0040111B    E8 0C000000      CALL 0040112C
00401120                     <ASCII>                            ; - "ReverseCore", 0
0040112C    E8 14000000      CALL 00401145
00401131                     <ASCII>                            ; - "www.reversecore.com", 0
00401145    6A 00            PUSH 0                             ; - hWnd (0)
00401147    FFD0             CALL EAX                           ; MessageBoxA(0, "www.reversecore.com", "ReverseCore", 0)
00401149    33C0             XOR EAX,EAX
0040114B    8BE5             MOV ESP,EBP
0040114D    5D               POP EBP
0040114E    C3               RETN
*/

BOOL SetPrivilege(LPCTSTR lpszPrivilege, BOOL bEnablePrivilege)
{
    TOKEN_PRIVILEGES tp;
    HANDLE hToken;
    LUID luid;

    if (!OpenProcessToken(GetCurrentProcess(),
        TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
        &hToken))
    {
        printf("OpenProcessToken error: %u\n", GetLastError());
        return FALSE;
    }

    if (!LookupPrivilegeValue(NULL,           // lookup privilege on local system  
        lpszPrivilege,  // privilege to lookup   
        &luid))        // receives LUID of privilege  
    {
        printf("LookupPrivilegeValue error: %u\n", GetLastError());
        return FALSE;
    }

    tp.PrivilegeCount = 1;
    tp.Privileges[0].Luid = luid;
    if (bEnablePrivilege)
        tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
    else
        tp.Privileges[0].Attributes = 0;

    // Enable the privilege or disable all privileges.  
    if (!AdjustTokenPrivileges(hToken,
        FALSE,
        &tp,
        sizeof(TOKEN_PRIVILEGES),
        (PTOKEN_PRIVILEGES)NULL,
        (PDWORD)NULL))
    {
        printf("AdjustTokenPrivileges error: %u\n", GetLastError());
        return FALSE;
    }

    if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
    {
        printf("The token does not have the specified privilege. \n");
        return FALSE;
    }

    return TRUE;
}

BOOL InjectCode(DWORD dwPID)
{
    HMODULE         hMod = NULL;
    THREAD_PARAM    param = { 0, };
    HANDLE          hProcess = NULL;
    HANDLE          hThread = NULL;
    LPVOID          pRemoteBuf[2] = { 0, };

    hMod = GetModuleHandleA("kernel32.dll");

    // set THREAD_PARAM  
    param.pFunc[0] = GetProcAddress(hMod, "LoadLibraryA");
    param.pFunc[1] = GetProcAddress(hMod, "GetProcAddress");

    // Open Process  
    if (!(hProcess = OpenProcess(PROCESS_ALL_ACCESS,               // dwDesiredAccess  
        FALSE,                            // bInheritHandle  
        dwPID)))                         // dwProcessId  
    {
        printf("OpenProcess() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    // Allocation for THREAD_PARAM  
    if (!(pRemoteBuf[0] = VirtualAllocEx(hProcess,                  // hProcess  
        NULL,                      // lpAddress  
        sizeof(THREAD_PARAM),      // dwSize  
        MEM_COMMIT,                // flAllocationType  
        PAGE_READWRITE)))         // flProtect  
    {
        printf("VirtualAllocEx() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    if (!WriteProcessMemory(hProcess,                               // hProcess  
        pRemoteBuf[0],                          // lpBaseAddress  
        (LPVOID)&param,                         // lpBuffer  
        sizeof(THREAD_PARAM),                   // nSize  
        NULL))                                 // [out] lpNumberOfBytesWritten  
    {
        printf("WriteProcessMemory() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    // Allocation for ThreadProc()  
    if (!(pRemoteBuf[1] = VirtualAllocEx(hProcess,                  // hProcess  
        NULL,                      // lpAddress  
        sizeof(g_InjectionCode),   // dwSize  
        MEM_COMMIT,                // flAllocationType  
        PAGE_EXECUTE_READWRITE))) // flProtect  
    {
        printf("VirtualAllocEx() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    if (!WriteProcessMemory(hProcess,                               // hProcess  
        pRemoteBuf[1],                          // lpBaseAddress  
        (LPVOID)&g_InjectionCode,               // lpBuffer  
        sizeof(g_InjectionCode),                // nSize  
        NULL))                                 // [out] lpNumberOfBytesWritten  
    {
        printf("WriteProcessMemory() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    if (!(hThread = CreateRemoteThread(hProcess,                    // hProcess  
        NULL,                        // lpThreadAttributes  
        0,                           // dwStackSize  
        (LPTHREAD_START_ROUTINE)pRemoteBuf[1],
        pRemoteBuf[0],               // lpParameter  
        0,                           // dwCreationFlags  
        NULL)))                     // lpThreadId  
    {
        printf("CreateRemoteThread() fail : err_code = %d\n", GetLastError());
        return FALSE;
    }

    WaitForSingleObject(hThread, INFINITE);

    CloseHandle(hThread);
    CloseHandle(hProcess);

    return TRUE;
}

int main(int argc, char* argv[])
{
    DWORD dwPID = 0;

    if (argc != 2)
    {
        printf("\n USAGE  : %s <pid>\n", argv[0]);
        return 1;
    }

    // change privilege  
    if (!SetPrivilege(SE_DEBUG_NAME, TRUE))
        return 1;

    // code injection  
    dwPID = (DWORD)atol(argv[1]);
    InjectCode(dwPID);

    return 0;
}

其中如下代码段就是插入的汇编指令：

对应的汇编指令为：