x64 shellcode 内存加载器

- 编译通过后，shellcode 二进制放进去 sc.txt，启动运行就行了。注意，我这里没有断下来，需要用调试器打开手动下断。

```
#include <stdio.h>
#include <windows.h>

int main() {
    HANDLE hFile = CreateFile(L"sc.txt", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        printf("无法打开文件\n");
        return 1;
    }

DWORD fileSize = GetFileSize(hFile, NULL);
    if (fileSize == INVALID_FILE_SIZE) {
        printf("无法获取文件大小\n");
        CloseHandle(hFile);
        return 1;
    }

BYTE* buffer = (BYTE*)malloc(fileSize);
    if (!buffer) {
        printf("内存分配失败\n");
        CloseHandle(hFile);
        return 1;
    }

DWORD bytesRead;
    BOOL success = ReadFile(hFile, buffer, fileSize, &bytesRead, NULL);

if (!success) {
        printf("读取文件失败\n");
        free(buffer);
        CloseHandle(hFile);
        return 1;
    }

PVOID lpAlloc = VirtualAlloc(0, fileSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
    memcpy(lpAlloc, buffer, fileSize);
    ((void(*)())lpAlloc)();

CloseHandle(hFile);
    return 0;
}
```