关于SSDT Hook的理论知识就不多说了。
简单的说一下Delphi开发KMD的一些需要注意的地方...这里使用DDDK---有点自己修改过的痕迹不过区别不大...自己可以看代码
1.KeServiceDescriptorTable是一个很特殊的函数...如果直接使用implib来进行创建库的话你会发现这个函数是被忽略的...因为偏移为0所以这个函数基本上只能起到标志作用没有任何实用价值....一些代码中出现了代码:
function SystemService(AFunc:Pointer):PLONG;beginResult:=PLONG(Cardinal(KeServiceDescriptorTable^.ServiceTableBase)+SizeOf(ULONG)*PULONG(ULONG(AFunc)+1)^);end;很容易让人误认为是运行后的返回值(PS:Delphi的函数调用可以不需要写xxx())上面说过因为这个函数几乎是没用的...所以不可能是执行他后返回地址还有一点需要注意的...难道这个地址是说函数的地址？？导入表中的确是可以创建这个函数...但是这个函数几乎是没用的...而且系统的SYS Loader也不可能为他填写正确的函数地址...这里取得地址就是他的本身地址...因为他的虚拟偏移为0所以你直接使用代码:
PPointer(@KeServiceDescriptorTable)^;得到这个地址就可以了2.fastcall的问题
这个问题很头痛.这个函数和delphi的调用方式完全不一样很容易让人误认为是相同的Delphi的寄存器调用方式是eax,edx,ecx,push...,etcvc的fastcall大部分是edx,ecx,etc....所以为了解决这个问题需要自己重写某些代码部分...3.基本上没什么需要注意了自己做好链接库您当然可以使用
mickeylan牛为我们制作的rmcoff...4.调试部分WinDbg什么的我就不说了...因为无法进行源码调试
个人觉得SysDebuger就不错其实asm也就那么回事。不是吗？呵呵下面写一个完整的SSDT Hook
代码:
{ NtOpenProcess[SSDT Hook] By Anskya Email: Anskya[at]Gmail.com}unit Driver;interface
uses
ntddk; // ---->DDDK.pasfunction _DriverEntry(DriverObject: PDriverObject; RegistryPath: PUnicodeString): NTSTATUS; stdcall;
implementation
type
TZwOpenProcess = function(ProcessHandle:PHandle; DesiredAccess:TAccessMask; ObjectAttributes:PObjectAttributes; ClientId:PClientId): NTSTATUS; stdcall;var
HookActive: Boolean; ZwOpenProcessNextHook: TZwOpenProcess;// 从导入表中获取一个函数的地址
function GetImportFunAddr(lpImportAddr: Pointer): Pointer; stdcall;begin Result := PPointer(PPointer(Cardinal(lpImportAddr) + 2)^)^;end;// KeServiceDescriptorTable+函数名计算SSDT函数偏移
function SystemServiceName(AFunc: Pointer): PLONG; stdcall;var lpKeServiceDescriptorTable: PServiceDescriptorEntry;begin lpKeServiceDescriptorTable := PPointer(@KeServiceDescriptorTable)^; Result := PLONG(Cardinal(lpKeServiceDescriptorTable^.ServiceTableBase) + (SizeOf(ULONG) * PULONG(ULONG(AFunc) + 1)^));end;// KeServiceDescriptorTable+序号名计算SSDT函数偏移
function SystemServiceOrd(iOrd: ULONG): PLONG; stdcall;var lpKeServiceDescriptorTable: PServiceDescriptorEntry;begin lpKeServiceDescriptorTable := PPointer(@KeServiceDescriptorTable)^; Result := PLONG(PLONG(Cardinal(lpKeServiceDescriptorTable^.ServiceTableBase) + (SizeOf(ULONG) * iOrd)));end;// 钩子过程
function ZwOpenProcessHookProc(ProcessHandle:PHandle; DesiredAccess:TAccessMask; ObjectAttributes:PObjectAttributes; ClientId:PClientId): NTSTATUS; stdcall;begin DbgPrint('ZwOpenProcess HookProc: NewZwOpenProcess(ProcessHandle:0x%.8X,DesiredAccess:0x%.8X,ObjectAttributes:0x%.8X,ClientId:0x%.8X)', ProcessHandle, DesiredAccess, ObjectAttributes, ClientId);Result := ZwOpenProcessNextHook(ProcessHandle, DesiredAccess, ObjectAttributes, ClientId);
DbgPrint('ZwOpenProcess HookProc: NewZwOpenProcess(-):0x%.8X', Result);end;// 驱动卸载过程
procedure DriverUnload(DriverObject:PDriverObject); stdcall;begin if (HookActive) then begin asm cli //disable WP bit push eax mov eax, cr0 //move CR0 register into EAX and eax, not 000010000h //disable WP bit mov cr0, eax //write register back pop eax end;ZwOpenProcessNextHook := TZwOpenProcess(xInterlockedExchange(SystemServiceName(GetImportFunAddr(@ZwOpenProcess)), LONG(@ZwOpenProcessNextHook)));
asm
push eax //enable WP bit mov eax, cr0 //move CR0 register into EAX or eax, 000010000h //enable WP bit mov cr0, eax //write register back pop eax sti end;DbgPrint('ZwOpenProcess New Address: 0x%.8X', SystemServiceName(GetImportFunAddr(@ZwOpenProcess))^);
DbgPrint('ZwOpenProcess Old Address: 0x%.8X', DWORD(@ZwOpenProcessNextHook));HookActive := False;
end; DbgPrint('DriverUnload(-)');end;// 驱动入口点
function _DriverEntry(DriverObject:PDriverObject;RegistryPath:PUnicodeString): NTSTATUS; stdcall;begin DriverObject^.DriverUnload := @DriverUnload; Result := STATUS_SUCCESS; DbgPrint('DriverEntry(-):0x%.8X', Result);HookActive := False;
DbgPrint('ZwOpenProcess Import Address: 0x%.8X', GetImportFunAddr(@ZwOpenProcess));
DbgPrint('KeServiceDescriptorTable() Address 1: 0x%.8X', @KeServiceDescriptorTable); DbgPrint('KeServiceDescriptorTable() Address 2: 0x%.8X', PPointer(@KeServiceDescriptorTable)^);DbgPrint('ZwOpenProcess ord Address: 0x%.8X', SystemServiceOrd($7A)^); // XP ord!
DbgPrint('ZwOpenProcess Name Address: 0x%.8X', SystemServiceName(GetImportFunAddr(@ZwOpenProcess))^); DbgPrint('ZwOpenProcess HookProc Address: 0x%.8X', @ZwOpenProcessHookProc);if (Not HookActive) then
begin // SSDT Hook asm //disable WP bit cli push eax mov eax, cr0 //move CR0 register into EAX and eax, not 000010000h //disable WP bit mov cr0, eax //write register back pop eax end;//lpNew^ := LONG(lpOld);
ZwOpenProcessNextHook := TZwOpenProcess(xInterlockedExchange(SystemServiceName(GetImportFunAddr(@ZwOpenProcess)), LONG(@ZwOpenProcessHookProc)));asm
push eax //enable WP bit mov eax, cr0 //move CR0 register into EAX or eax, 000010000h //enable WP bit mov cr0, eax //write register back pop eax sti end;DbgPrint('ZwOpenProcess New Address: 0x%.8X', SystemServiceName(GetImportFunAddr(@ZwOpenProcess))^);
DbgPrint('ZwOpenProcess Old Address: 0x%.8X', DWORD(@ZwOpenProcessNextHook));HookActive := True;
end else begin DbgPrint('ZwOpenProcess Hooked!!! By Anskya'); end;end;
end.
关于function GetImportFunAddr(lpImportAddr: Pointer): Pointer; stdcall;这个函数稍微说一下...如果你使用的连接库是x86模式的你就不能这样了。。。这个是标准格式...call [xxxx]---->jmp [xxxxxx]---->函数地址x86模式的lib是直接call [xxxx]---->函数地址这里需要注意一下这个函数你可以本地获取一下Ring3下的函数地址吧...这个我就不多说了...相信大家import hook玩的都比我熟