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  1. #1
    Dwar
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    SSDT HOOK source code

    SSDT HOOK source code

    Code:
    #include<ntddk.h>
    
    typedef struct _SERVICE_DESCRIPTOR_TABLE
    {
      PVOID   ServiceTableBase;
      PULONG  ServiceCounterTableBase;
      ULONG   NumberOfService;
      ULONG   ParamTableBase;
    }SERVICE_DESCRIPTOR_TABLE,*PSERVICE_DESCRIPTOR_TABLE; // As KeServiceDescriptorTable only one here on the simple point
    extern PSERVICE_DESCRIPTOR_TABLE    KeServiceDescriptorTable;//KeServiceDescriptorTable For the exported function
    
    /////////////////////////////////////
    VOID Hook();
    VOID Unhook();
    VOID OnUnload(IN PDRIVER_OBJECT DriverObject);
    //////////////////////////////////////
    ULONG JmpAddress; //Jump to NtOpenProcess address
    ULONG OldServiceAddress;//Original NtOpenProcess service address
    //////////////////////////////////////
    __declspec(naked) NTSTATUS __stdcall MyNtOpenProcess(PHANDLE ProcessHandle,
                   ACCESS_MASK DesiredAccess,
                   POBJECT_ATTRIBUTES ObjectAttributes,
                   PCLIENT_ID ClientId) 
    {
      DbgPrint("NtOpenProcess() called");
      __asm{
        push    0C4h
        push    804eb560h  //10 bytes
        jmp     [JmpAddress]     
      }
    }
    ///////////////////////////////////////////////////
    NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,PUNICODE_STRING RegistryPath)
    {
      DriverObject->DriverUnload = OnUnload;
      DbgPrint("Unhooker load");
      Hook();
      return STATUS_SUCCESS;
    }
    /////////////////////////////////////////////////////
    VOID OnUnload(IN PDRIVER_OBJECT DriverObject)
    {
      DbgPrint("Unhooker unload!");
      Unhook();
    }
    /////////////////////////////////////////////////////
    VOID Hook()
    {
      ULONG  Address;
      Address = (ULONG)KeServiceDescriptorTable->ServiceTableBase + 0x7A * 4;//0x7A for NtOpenProcess service ID
      DbgPrint("Address:0xX",Address);
    
      OldServiceAddress = *(ULONG*)Address;//Save original NtOpenProcess address
      DbgPrint("OldServiceAddress:0xX",OldServiceAddress);
    
      DbgPrint("MyNtOpenProcess:0xX",MyNtOpenProcess);
    
      JmpAddress = (ULONG)NtOpenProcess + 10; //Jump to NtOpenProcess function header +10
      DbgPrint("JmpAddress:0xX",JmpAddress);
        
      __asm{				//Remove the memory protection
        cli
             mov  eax,cr0
        and  eax,not 10000h
        mov  cr0,eax
      }
    
      *((ULONG*)Address) = (ULONG)MyNtOpenProcess;	//HOOK SSDT
    
      __asm{				//Restore the memory protection
              mov  eax,cr0
        or   eax,10000h
        mov  cr0,eax
        sti
      }
    }
    //////////////////////////////////////////////////////
    VOID Unhook()
    {
      ULONG  Address;
      Address = (ULONG)KeServiceDescriptorTable->ServiceTableBase + 0x7A * 4;	//Find SSDT
    
      __asm{
        cli
              mov  eax,cr0
        and  eax,not 10000h
        mov  cr0,eax
      }
    
      *((ULONG*)Address) = (ULONG)OldServiceAddress;	//Restore SSDT
    
      __asm{  
             mov  eax,cr0
        or   eax,10000h
        mov  cr0,eax
        sti
      }
    
      //Debugging
      DbgPrint("Unhook");
    }
    P.S. Code isn't mine, just found in my source archive. Maybe useful for some one
    Please, post your questions on forum, not by PM or mail

    I spend my time, so please pay a little bit of your time to keep world in equilibrium

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  3. #2
    emoisback
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    ahaaaa....
    this one better to understand >,<..
    and i will post my question here if i have ..
    Learn from PGC for Share on PGC..


    For another Stuff i have make try to find it [Please, register to view links]
    If i have help you, please thanks and respect ..

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  5. #3
    darkendemon
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    Doubt

    Thank You For ur help.
    In that code they specify #include<ntddk.h> to install driver in kernel.It is enough to include that header alone.Can u explain that.I AM confused about that use of header file and how to install as a driver to hook the SSDT.
    Thank You

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