回調監控文件

????使用?ObRegisterCallbacks?實現保護進程，其實稍微?PATCH?下內核，這個函數還能實現文件操作監視。但可惜只能在?WIN7X64?上用。因為在?WIN7X64?上?PATCH?對象結構的成員（ObjectType->TypeInfo.SupportsObjectCallbacks）是合法的，在?WIN8X64?以及之后系統上會觸發?PATCHGUARD。但是經過實際測試，我手里的Win7?64?是可以在不修改myobtype->TypeInfo.SupportsObjectCallbacks?=?1;的前提下直接注冊回調，但是win8?64不行，win8?64?修改了myobtype->TypeInfo.SupportsObjectCallbacks?=?1;之后發現沒有藍屏并且目前可以成功進行回調處理（只測試了手里的一臺win8?64）。文件回調容易出問題，頻率非常高。使用的時候建議使用成熟的文件過濾框架。

使用的時候和進程線程的回調句柄處理一樣，需要修改標記使得無簽名可以正常注冊回調，然后在修改文件的myobtype->TypeInfo.SupportsObjectCallbacks?=?1;然后在進行回調注冊就行了。

注冊： // init callbacks OB_CALLBACK_REGISTRATION obReg; OB_OPERATION_REGISTRATION opReg; memset(&obReg, 0, sizeof(obReg)); obReg.Version = ObGetFilterVersion(); obReg.OperationRegistrationCount = 1; obReg.RegistrationContext = NULL; RtlInitUnicodeString(&obReg.Altitude, L"321000"); obReg.OperationRegistration = &opReg; memset(&opReg, 0, sizeof(opReg)); opReg.ObjectType = IoFileObjectType; opReg.Operations = OB_OPERATION_HANDLE_CREATE|OB_OPERATION_HANDLE_DUPLICATE; opReg.PreOperation = (POB_PRE_OPERATION_CALLBACK)&preCall; //opReg.PostOperation = (POB_POST_OPERATION_CALLBACK)&postCall;//不需要 // register callbacks status = ObRegisterCallbacks(&obReg, &obHandle); 注銷： ObUnRegisterCallbacks(obHandle);回調函數： PVOID obHandle;OB_PREOP_CALLBACK_STATUS preCall(PVOID RegistrationContext, POB_PRE_OPERATION_INFORMATION OperationInformation) { UNICODE_STRING DosName; PFILE_OBJECT fileo = OperationInformation->Object; HANDLE CurrentProcessId = PsGetCurrentProcessId(); UNREFERENCED_PARAMETER(RegistrationContext); if( OperationInformation->ObjectType!=*IoFileObjectType ) return OB_PREOP_SUCCESS; //過濾無效指針 if( fileo->FileName.Buffer==NULL || !MmIsAddressValid(fileo->FileName.Buffer) || fileo->DeviceObject==NULL || !MmIsAddressValid(fileo->DeviceObject) ) return OB_PREOP_SUCCESS; //過濾無效路徑 if( !_wcsicmp(fileo->FileName.Buffer,L"\\Endpoint") || !_wcsicmp(fileo->FileName.Buffer,L"?") || !_wcsicmp(fileo->FileName.Buffer,L"\\.\\.") || !_wcsicmp(fileo->FileName.Buffer,L"\\")) return OB_PREOP_SUCCESS; //阻止訪問readme.txt if(wcsstr(_wcslwr(fileo->FileName.Buffer),L"xxxx.txt")) { if (OperationInformation->Operation == OB_OPERATION_HANDLE_CREATE) { OperationInformation->Parameters->CreateHandleInformation.DesiredAccess=0; } if(OperationInformation->Operation == OB_OPERATION_HANDLE_DUPLICATE) { OperationInformation->Parameters->DuplicateHandleInformation.DesiredAccess=0; } } RtlVolumeDeviceToDosName(fileo->DeviceObject, &DosName); DbgPrint("[FILE_MONITOR_X64][PID]%ld [File]%wZ%wZ\n", (ULONG64)CurrentProcessId, &DosName, &fileo->FileName); return OB_PREOP_SUCCESS; }文件標記處理相關結構體： typedef struct _OBJECT_TYPE_INITIALIZER // 25 elements, 0x70 bytes (sizeof) { /*0x000*/ UINT16 Length;union // 2 elements, 0x1 bytes (sizeof){ /*0x002*/ UINT8 ObjectTypeFlags;struct // 7 elements, 0x1 bytes (sizeof){ /*0x002*/ UINT8 CaseInsensitive : 1; // 0 BitPosition /*0x002*/ UINT8 UnnamedObjectsOnly : 1; // 1 BitPosition /*0x002*/ UINT8 UseDefaultObject : 1; // 2 BitPosition /*0x002*/ UINT8 SecurityRequired : 1; // 3 BitPosition /*0x002*/ UINT8 MaintainHandleCount : 1; // 4 BitPosition /*0x002*/ UINT8 MaintainTypeList : 1; // 5 BitPosition /*0x002*/ UINT8 SupportsObjectCallbacks : 1; // 6 BitPosition};}; /*0x004*/ ULONG32 ObjectTypeCode; /*0x008*/ ULONG32 InvalidAttributes; /*0x00C*/ struct _GENERIC_MAPPING GenericMapping; // 4 elements, 0x10 bytes (sizeof) /*0x01C*/ ULONG32 ValidAccessMask; /*0x020*/ ULONG32 RetainAccess; /*0x024*/ enum _POOL_TYPE PoolType; /*0x028*/ ULONG32 DefaultPagedPoolCharge; /*0x02C*/ ULONG32 DefaultNonPagedPoolCharge; /*0x030*/ PVOID DumpProcedure; /*0x038*/ PVOID OpenProcedure; /*0x040*/ PVOID CloseProcedure; /*0x048*/ PVOID DeleteProcedure; /*0x050*/ PVOID ParseProcedure; /*0x058*/ PVOID SecurityProcedure; /*0x060*/ PVOID QueryNameProcedure; /*0x068*/ PVOID OkayToCloseProcedure; }OBJECT_TYPE_INITIALIZER, *POBJECT_TYPE_INITIALIZER;typedef struct _EX_PUSH_LOCK // 7 elements, 0x8 bytes (sizeof) {union // 3 elements, 0x8 bytes (sizeof){struct // 5 elements, 0x8 bytes (sizeof){ /*0x000*/ UINT64 Locked : 1; // 0 BitPosition /*0x000*/ UINT64 Waiting : 1; // 1 BitPosition /*0x000*/ UINT64 Waking : 1; // 2 BitPosition /*0x000*/ UINT64 MultipleShared : 1; // 3 BitPosition /*0x000*/ UINT64 Shared : 60; // 4 BitPosition}; /*0x000*/ UINT64 Value; /*0x000*/ VOID* Ptr;}; }EX_PUSH_LOCK, *PEX_PUSH_LOCK;typedef struct _MY_OBJECT_TYPE // 12 elements, 0xD0 bytes (sizeof) { /*0x000*/ struct _LIST_ENTRY TypeList; // 2 elements, 0x10 bytes (sizeof) /*0x010*/ struct _UNICODE_STRING Name; // 3 elements, 0x10 bytes (sizeof) /*0x020*/ VOID* DefaultObject; /*0x028*/ UINT8 Index; /*0x029*/ UINT8 _PADDING0_[0x3]; /*0x02C*/ ULONG32 TotalNumberOfObjects; /*0x030*/ ULONG32 TotalNumberOfHandles; /*0x034*/ ULONG32 HighWaterNumberOfObjects; /*0x038*/ ULONG32 HighWaterNumberOfHandles; /*0x03C*/ UINT8 _PADDING1_[0x4]; /*0x040*/ struct _OBJECT_TYPE_INITIALIZER TypeInfo; // 25 elements, 0x70 bytes (sizeof) /*0x0B0*/ struct _EX_PUSH_LOCK TypeLock; // 7 elements, 0x8 bytes (sizeof) /*0x0B8*/ ULONG32 Key; /*0x0BC*/ UINT8 _PADDING2_[0x4]; /*0x0C0*/ struct _LIST_ENTRY CallbackList; // 2 elements, 0x10 bytes (sizeof) }MY_OBJECT_TYPE, *PMY_OBJECT_TYPE;處理文件標記： VOID EnableObType(POBJECT_TYPE ObjectType) { PMY_OBJECT_TYPE myobtype = (PMY_OBJECT_TYPE)ObjectType; myobtype->TypeInfo.SupportsObjectCallbacks = 1; } EnableObType(*IoFileObjectType); 結果：

Win7?64

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Win8?64

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總結

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