写其他进程的环境变量

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <assert.h>
#include <tlhelp32.h>

DWORD GetParentProcessId(DWORD pid)
{
    DWORD ppid = (DWORD)(-1);
    HANDLE hProcessSnap;
    PROCESSENTRY32 pe32;

    hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
    assert(hProcessSnap != INVALID_HANDLE_VALUE);

    pe32.dwSize = sizeof( PROCESSENTRY32 );
    BOOL bResult = Process32First( hProcessSnap, &pe32 );
    assert(bResult != FALSE);

    do
    {
        if (pid == pe32.th32ProcessID)
        {
            ppid = pe32.th32ParentProcessID;
            break;
        }
    } while( Process32Next( hProcessSnap, &pe32 ) );

    CloseHandle( hProcessSnap );
    return( ppid );
}

DWORD ppid(VOID)
{
    return GetParentProcessId( GetCurrentProcessId() );
}


typedef struct _RemoteParam {
    DWORD funcptr;
    BYTE Param1[64];
    BYTE Param2[64];
} RemoteParam, *PRemoteParam;

typedef int  (WINAPI *PFN_MessageBox)(HWND, LPCTSTR, LPCTSTR, DWORD);
typedef BOOL (WINAPI *PFN_SetEnvironmentVariable)(LPCTSTR, LPCTSTR);


DWORD WINAPI threadProc(LPVOID lpParam)
{
    RemoteParam *pRP = (RemoteParam *)lpParam;

    PFN_SetEnvironmentVariable pfnSetEnvironmentVariable = (PFN_SetEnvironmentVariable)pRP[0].funcptr;
    pfnSetEnvironmentVariable(pRP[0].Param1, pRP[0].Param2);

    PFN_MessageBox pfnMessageBox = (PFN_MessageBox)pRP[1].funcptr;
    pfnMessageBox(NULL, pRP[1].Param1, pRP[1].Param2, 0);

    return 0;
}


int main(int argc, char *argv[])
{
    DWORD dwProcessId = ppid();
    assert(dwProcessId != (DWORD)(-1));

    HANDLE hTargetProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId); 
    assert(hTargetProcess != NULL);

    DWORD dwMemSize = 4096;
    LPVOID pRemoteThread = VirtualAllocEx(hTargetProcess, 0, dwMemSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE) ; 
    assert(pRemoteThread != NULL);
    BOOL bResult = WriteProcessMemory(hTargetProcess, pRemoteThread, threadProc, dwMemSize, NULL) ; 
    assert(bResult != FALSE);

    RemoteParam RemoteParams[2] = {{0}};
    HMODULE hUser32 = LoadLibrary("User32.dll");
    HMODULE hKernel32 = LoadLibrary("Kernel32.dll");

    RemoteParams[0].funcptr = (DWORD)GetProcAddress(hKernel32, "SetEnvironmentVariableA");
    strcpy(RemoteParams[0].Param1, "__var");
    strcpy(RemoteParams[0].Param2, "hello");
    RemoteParams[1].funcptr = (DWORD)GetProcAddress(hUser32, "MessageBoxA");
    strcpy(RemoteParams[1].Param1, "www.bathome.net");
    strcpy(RemoteParams[1].Param2, "hello");

    dwMemSize = sizeof(RemoteParams);
    LPVOID pRemoteParam = VirtualAllocEx(hTargetProcess, 0, dwMemSize, MEM_COMMIT, PAGE_READWRITE);
    assert(pRemoteParam != NULL);
    bResult = WriteProcessMemory(hTargetProcess, pRemoteParam, RemoteParams, dwMemSize, NULL) ; 
    assert(bResult != FALSE);

    HANDLE hRemoteThread = CreateRemoteThread(hTargetProcess, NULL, 0, pRemoteThread, pRemoteParam, 0, NULL); 
    assert(hRemoteThread != NULL);

    CloseHandle(hRemoteThread);
    CloseHandle(hTargetProcess);
    return 0;
}

出处: http://bbs.bathome.net/viewthread.php?tid=19036