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unhook.c
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#include "driver.h"
PSERVICE_DESCRIPTOR_TABLE DDKAPI GetServiceDescriptorShadowTableAddress(){
PBYTE check=(PBYTE)KeAddSystemServiceTable;
PSERVICE_DESCRIPTOR_TABLE rc=NULL;UINT i;
for(i=0;i<1024;i++){
rc=*(PPSERVICE_DESCRIPTOR_TABLE)check;
if(!MmIsAddressValid(rc)||((PVOID)rc==(PVOID)&KeServiceDescriptorTable)
||(memcmp(rc,&KeServiceDescriptorTable,sizeof(SYSTEM_SERVICE_TABLE)))){
check++;rc=NULL;
}
if(rc)
break;
}
return rc;
}
PSYSTEM_MODULE_INFORMATION GetSystemModuleInformation(){
PSYSTEM_MODULE_INFORMATION pSMInfo=NULL;
NTSTATUS Status=STATUS_NO_MEMORY;
ULONG SMInfoLen=1000;
do{
pSMInfo=ExAllocatePoolWithTag(PagedPool,SMInfoLen,0);
if(!pSMInfo)
break;
Status=ZwQuerySystemInformation(SystemModuleInformation,pSMInfo,SMInfoLen,&SMInfoLen);
if(!NT_SUCCESS(Status)){
ExFreePoolWithTag(pSMInfo,0);
pSMInfo=NULL;
}
}while(Status==STATUS_INFO_LENGTH_MISMATCH);
return pSMInfo;
}
PSYSTEM_HANDLE_INFORMATION_EX GetSystemHandleInformation(){
PSYSTEM_HANDLE_INFORMATION_EX pSHInfo=NULL;
NTSTATUS Status=STATUS_NO_MEMORY;
ULONG SMInfoLen=0x1000;
do{
pSHInfo=ExAllocatePoolWithTag(PagedPool,SMInfoLen,0);
if(!pSHInfo)
break;
Status=ZwQuerySystemInformation(SystemHandleInformation,pSHInfo,SMInfoLen,&SMInfoLen);
if(!NT_SUCCESS(Status)){
ExFreePoolWithTag(pSHInfo,0);
pSHInfo=NULL;
}
}while(Status==STATUS_INFO_LENGTH_MISMATCH);
return pSHInfo;
}
PVOID GetKernelBaseAddressByAddress(PSYSTEM_MODULE_INFORMATION pSMInfo,PVOID pAddress,PVOID* pKernelAddr){
if(pSMInfo){
UINT i;
for(i=0;i<pSMInfo->Count;i++){
if(pAddress>=pSMInfo->Module[i].Base&&pAddress<=(pSMInfo->Module[i].Base+pSMInfo->Module[i].Size)){
if(pKernelAddr)
*pKernelAddr=(PVOID)pSMInfo->Module[i].Base;
return &pSMInfo->Module[i].ImageName[pSMInfo->Module[i].PathLength];
}
}
}
return NULL;
}
ULONG RVAToRaw(PVOID lpBase,ULONG VirtualAddress,PULONG pImageBase){
PIMAGE_DOS_HEADER pDosHeader=(PIMAGE_DOS_HEADER)lpBase;
if(pDosHeader->e_magic!=IMAGE_DOS_SIGNATURE)
return 0;
PIMAGE_NT_HEADERS pNtHeader=(PIMAGE_NT_HEADERS)((PBYTE)lpBase+pDosHeader->e_lfanew);
if(pNtHeader->Signature!=IMAGE_NT_SIGNATURE)
return 0;
if(pImageBase)
*pImageBase=pNtHeader->OptionalHeader.ImageBase;
UINT i;
for(i=0;i<pNtHeader->FileHeader.NumberOfSections;i++){
IMAGE_SECTION_HEADER *pSectionHeader=(PIMAGE_SECTION_HEADER)((LPBYTE)&pNtHeader->OptionalHeader+pNtHeader->FileHeader.SizeOfOptionalHeader+(i*sizeof(IMAGE_SECTION_HEADER)));
if(VirtualAddress>=pSectionHeader->VirtualAddress&&VirtualAddress<=(pSectionHeader->VirtualAddress+pSectionHeader->SizeOfRawData))
return VirtualAddress-pSectionHeader->VirtualAddress+pSectionHeader->PointerToRawData;
}
return 0;
}
HANDLE GetCsrssPid(){
HANDLE CsrId=(HANDLE)0;
PSYSTEM_HANDLE_INFORMATION_EX pHandles=GetSystemHandleInformation();
if(pHandles){
UINT i;
for(i=0;i<pHandles->Count&&!CsrId;i++){
OBJECT_ATTRIBUTES obj;CLIENT_ID cid;
HANDLE Process,hObject;
InitializeObjectAttributes(&obj,NULL,OBJ_KERNEL_HANDLE,NULL,NULL);
cid.UniqueProcess=(HANDLE)pHandles->Handle[i].ProcessId;
cid.UniqueThread=0;
if(NT_SUCCESS(NtOpenProcess(&Process,PROCESS_DUP_HANDLE,&obj,&cid))){
if(NT_SUCCESS(ZwDuplicateObject(Process,(PHANDLE)(pHandles->Handle[i].Handle),NtCurrentProcess(),&hObject,0,FALSE,DUPLICATE_SAME_ACCESS))){
UCHAR Buff[0x200];
POBJECT_NAME_INFORMATION ObjName=(PVOID)&Buff;
if(NT_SUCCESS(ZwQueryObject(hObject,ObjectTypeInformation,ObjName,sizeof(Buff),NULL))){
if(ObjName->Name.Buffer&&(!wcsncmp(L"Port",ObjName->Name.Buffer,4)||!wcsncmp(L"ALPC Port",ObjName->Name.Buffer,9))){
if(NT_SUCCESS(ZwQueryObject(hObject,ObjectNameInformation,ObjName,sizeof(Buff),NULL))){
if(ObjName->Name.Buffer&&!wcsncmp(L"\\\\Windows\\\\ApiPort",ObjName->Name.Buffer,20))
CsrId=(HANDLE)pHandles->Handle[i].ProcessId;
}
}
}
ZwClose(hObject);
}
NtClose(Process);
}
}
ExFreePoolWithTag(pHandles,0);
}
return CsrId;
}
VOID RestoreHooks(PSYSTEM_MODULE_INFORMATION pSMInfo,PSYSTEM_SERVICE_TABLE pTable){
CHAR sKernelPath[1024]={0};PVOID pKernelAddres=NULL;
PCHAR pKrnlMod=GetKernelBaseAddressByAddress(pSMInfo,pTable->ServiceTable,&pKernelAddres);
if(pKrnlMod&&pKernelAddres){
ULONG uImageBase=0;
ULONG uSSDTRaw=RVAToRaw(pKernelAddres,(ULONG)pTable->ServiceTable-(ULONG)pKernelAddres,&uImageBase);
if(uSSDTRaw!=0&&uImageBase!=0){
ANSI_STRING aFileName;UNICODE_STRING uFileName;
sprintf(sKernelPath,"\\\\SystemRoot\\\\System32\\\\%s",pKrnlMod);
RtlInitAnsiString(&aFileName,sKernelPath);
if(NT_SUCCESS(RtlAnsiStringToUnicodeString(&uFileName,&aFileName,TRUE))){
OBJECT_ATTRIBUTES ObjAttr;HANDLE hFile;IO_STATUS_BLOCK ioStatus;
InitializeObjectAttributes(&ObjAttr,&uFileName,OBJ_CASE_INSENSITIVE,NULL,NULL);
if(NT_SUCCESS(ZwOpenFile(&hFile,FILE_READ_DATA,&ObjAttr,&ioStatus,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,FILE_SYNCHRONOUS_IO_NONALERT))){
PULONG lpArraySSDT=ExAllocatePool(PagedPool,pTable->ServiceLimit*sizeof(ULONG));
if(lpArraySSDT!=NULL){
FILE_POSITION_INFORMATION FilePos={{{uSSDTRaw,0}}};
if(NT_SUCCESS(ZwSetInformationFile(hFile,&ioStatus,&FilePos,sizeof(FILE_POSITION_INFORMATION),FilePositionInformation))){
if(NT_SUCCESS(ZwReadFile(hFile,NULL,NULL,NULL,&ioStatus,lpArraySSDT,pTable->ServiceLimit*sizeof(ULONG),NULL,NULL))){
asm(
"cli;\\r\\n" /*dissable interrupt*/
"mov %cr0,%eax;\\r\\n" /*mov CR0 register into EAX*/
"and $0xfffeffff,%eax;\\r\\n" /*disable WP bit*/
"mov %eax,%cr0;\\r\\n" /*update register*/
"sti" /*enable interrupt*/
);
UINT i=0;
for(i=0;i<pTable->ServiceLimit;i++){
NTPROC pOrigAddress=(NTPROC)(lpArraySSDT[i]-uImageBase+pKernelAddres);
if(pTable->ServiceTable[i]!=pOrigAddress){
LPCSTR sHooker=GetKernelBaseAddressByAddress(pSMInfo,pTable->ServiceTable[i],NULL);
if(!sHooker)sHooker="Unknown";
DbgPrint("Func %d Hooked by %s! Current: %p - Original: %p",i,sHooker,pTable->ServiceTable[i],pOrigAddress);
pTable->ServiceTable[i]=pOrigAddress;
DbgPrint("Func %d Unhook %s",i,(pTable->ServiceTable[i]==pOrigAddress?"OK":"FAIL"));
}
}
asm(
"cli;\\r\\n" /*dissable interrupt*/
"mov %cr0,%eax;\\r\\n" /*mov CR0 register into EAX*/
"or $0x00010000,%eax;\\r\\n" /*enable WP bit*/
"mov %eax,%cr0;\\r\\n" /*update register*/
"sti" /*enable interrupt*/
);
}else
DbgPrint("Error: Can't Read Kernel File");
}else
DbgPrint("Error: Can't Change Kernel File Position");
ExFreePool(lpArraySSDT);
}else
DbgPrint("Error: Can't Alloc Memory!\\n");
NtClose(hFile);
}else
DbgPrint("Error: Can't Open Kernel File");
RtlFreeUnicodeString(&uFileName);
}else
DbgPrint("Error: Can't Convert to Unicode");
}else
DbgPrint("Error: Can't Get SSDT RAW Address");
}else
DbgPrint("Error: Can't Get Kernel Address!\\n");
}
VOID FindHooks(){
DbgPrint("Start Finding Hooks in SSDT!\\n");
PSYSTEM_MODULE_INFORMATION pSMInfo=GetSystemModuleInformation();
if(pSMInfo){
//ntoskrnl
DbgPrint("Finding Hooks in NTOSKrnl!\\n");
RestoreHooks(pSMInfo,&KeServiceDescriptorTable);
DbgPrint("Find Hooks in NTOSKrnl Complete!\\n");
//win32k
PSERVICE_DESCRIPTOR_TABLE pShadow=GetServiceDescriptorShadowTableAddress();
if(pShadow){
PEPROCESS EProcess;
HANDLE hCsrssPid=GetCsrssPid();
//we need to do this to have access to win32k memory...
if(hCsrssPid&&NT_SUCCESS(PsLookupProcessByProcessId(hCsrssPid,&EProcess))){
KeAttachProcess(EProcess);
DbgPrint("Finding Hooks in Win32k!\\n");
RestoreHooks(pSMInfo,&pShadow->win32k);
DbgPrint("Find Hooks in Win32k Complete!\\n");
KeDetachProcess();
ObDereferenceObject(EProcess);
}else
DbgPrint("Error: Can't get CSRSS Process Id!\\n");
}else
DbgPrint("Error: Can't get Win32k Address!\\n");
ExFreePoolWithTag(pSMInfo,0);
}else
DbgPrint("Error: GetSystemModuleInformation Fail!\\n");
DbgPrint("End Finding Hooks in SSDT!\\n");
}
VOID DDKAPI DriverUnload(IN PDRIVER_OBJECT DriverObject) {
DbgPrint("DriverUnload()!\\n");
return;
}
__declspec (dllexport) NTSTATUS DDKAPI DriverEntry(IN PDRIVER_OBJECT pDriverObject,IN PUNICODE_STRING RegistryPath) {
NTSTATUS NtStatus=STATUS_SUCCESS;
pDriverObject->DriverUnload=DriverUnload;
DbgPrint("DriverEntry()!\\n");
FindHooks();
return NtStatus;
}