获取Kernel32基地址的几种方法-相关结构

ゞ浴缸里的玫瑰 2022-03-19 11:37 675阅读 0赞

一、几个重要的数据结构，可以通过windbg的dt命令查看其详细信息

\_PEB、\_PEB\_LDR\_DATA、\_LDR\_DATA\_TABLE\_ENTRY

二、技术原理

1、通过fs:\[30h\]获取当前进程的\_PEB结构

2、通过\_PEB的Ldr成员获取\_PEB\_LDR\_DATA结构

3、通过\_PEB\_LDR\_DATA的InMemoryOrderModuleList成员获取\_LIST\_ENTRY结构

4、通过\_LIST\_ENTRY的Flink成员获取\_LDR\_DATA\_TABLE\_ENTRY结构，注意：这里的Flink指向的是\_LDR\_DATA\_TABLE\_ENTRY结构中的InMemoryOrderLinks成员，因此需要计算真正的\_LDR\_DATA\_TABLE\_ENTRY起始地址，我们可以用CONTAINING\_RECORD来计算。

5、输出\_LDR\_DATA\_TABLE\_ENTRY的BaseDllName或FullDllName成员信息。

三、代码实现(基于XP sp2 系统)

//EnumInLoadModule.c  
    //compile:cl EnumInLoadModule.c  
    #include <windows.h>  
    
    #define CONTAINING_RECORD(address, type, field) ((type *)( /  
    (PCHAR)(address) - /  
    (ULONG_PTR)(&((type *)0)->field)))  
    
    typedef struct _UNICODE_STRING {  
        USHORT  Length;  
        USHORT  MaximumLength;  
        PWSTR  Buffer;  
    } UNICODE_STRING, *PUNICODE_STRING;  
    
    typedef struct _PEB_LDR_DATA  
    {  
        DWORD Length;  
        UCHAR Initialized;  
        PVOID SsHandle;  
        LIST_ENTRY InLoadOrderModuleList;  
        LIST_ENTRY InMemoryOrderModuleList;  
        LIST_ENTRY InInitializationOrderModuleList;  
        PVOID EntryInProgress;  
    }PEB_LDR_DATA,*PPEB_LDR_DATA;  
    
    typedef struct _LDR_DATA_TABLE_ENTRY  
    {  
        LIST_ENTRY InLoadOrderLinks;  
        LIST_ENTRY InMemoryOrderLinks;  
        LIST_ENTRY InInitializationOrderLinks;  
        PVOID DllBase;  
        PVOID EntryPoint;  
        DWORD SizeOfImage;  
        UNICODE_STRING FullDllName;  
        UNICODE_STRING BaseDllName;  
        DWORD Flags;  
        WORD LoadCount;  
        WORD TlsIndex;  
        LIST_ENTRY HashLinks;  
        PVOID SectionPointer;  
        DWORD CheckSum;  
        DWORD TimeDateStamp;  
        PVOID LoadedImports;  
        PVOID EntryPointActivationContext;  
        PVOID PatchInformation;  
    }LDR_DATA_TABLE_ENTRY,*PLDR_DATA_TABLE_ENTRY;  
    
    其中，InLoadOrderModuleList(xp下第一个结点XXX.exe 第二个是ntdll.dll, win7:ntdll.dll,kernel32.dll)、InMemoryOrderModuleList（1.xx.exe 2.ntdll.dll win7:xx.exe,ntdll.dll）、InInitializationOrderModuleList(xp下第一个结点一般是ntdll.dll，第二个是 kernel32.dll win7:ntdll,kernelbase.dll)就是进程当前已加载模块的链表，只是按照不同的方式排序。EnumProcessModules是通过InMemoryOrderModuleList链表枚举的，而根据Win2k代码，ToolHelp32函数是通过InLoadOrderModuleList枚举。这三个_LIST_ENTRY都是在一个RTL_PROCESS_MODULE_INFORMATION结构中的成员。这个结构在2k代码中有引用，不过没有确切的定义

typedef struct _PEB  
    {  
        UCHAR InheritedAddressSpace;  
        UCHAR ReadImageFileExecOptions;  
        UCHAR BeingDebugged;  
        UCHAR SpareBool;  
        PVOID Mutant;  
        PVOID ImageBaseAddress;  
        PPEB_LDR_DATA Ldr;

//......  
    }PEB,*PPEB;  
    
    int main(void)  
    {  
        PLDR_DATA_TABLE_ENTRY pLdrDataEntry = NULL;  
        PLIST_ENTRY pListEntryStart = NULL,pListEntryEnd = NULL;  
        PPEB_LDR_DATA pPebLdrData = NULL;  
        PPEB pPeb = NULL;  
    
        //故意加载一些DLL，以便测试!  
        LoadLibrary("ResLibDemo");  
        __asm  
        {  
            //1、通过fs:[30h]获取当前进程的_PEB结构  
            mov eax,dword ptr fs:[30h];  
            mov pPeb,eax  
        }  
    
        //2、通过_PEB的Ldr成员获取_PEB_LDR_DATA结构  
        pPebLdrData = pPeb->Ldr;  
    
        //3、通过_PEB_LDR_DATA的InMemoryOrderModuleList成员获取_LIST_ENTRY结构  
        pListEntryStart = pListEntryEnd = pPebLdrData->InMemoryOrderModuleList.Flink;  
    
        //查找所有已载入到内存中的模块  
        do  
        {  
            //4、通过_LIST_ENTRY的Flink成员获取_LDR_DATA_TABLE_ENTRY结构  
            pLdrDataEntry = (PLDR_DATA_TABLE_ENTRY)CONTAINING_RECORD(pListEntryStart,LDR_DATA_TABLE_ENTRY,InMemoryOrderLinks);  
    
            //5、输出_LDR_DATA_TABLE_ENTRY的BaseDllName或FullDllName成员信息  
            printf("%S/n",pLdrDataEntry->BaseDllName.Buffer);  
    
            pListEntryStart = pListEntryStart->Flink;  
    
        }while(pListEntryStart != pListEntryEnd);  
    }  
    
    /* 
    output: 
    EnumInLoadModule.exe 
    ntdll.dll 
    kernel32.dll 
    ResLibDemo.dll 
    ...

\*/

typedef struct \_LDR\_DATA\_TABLE\_ENTRY  
\{  
  
LIST\_ENTRY InLoadOrderLinks;  
LIST\_ENTRY InMemoryOrderLinks;  
LIST\_ENTRY InInitializationOrderLinks;  
PVOID DllBase;  
PVOID EntryPoint;  
ULONG SizeOfImage;  
UNICODE\_STRING FullDllName;  
UNICODE\_STRING BaseDllName;  
ULONG Flags;  
USHORT LoadCount;  
USHORT TlsIndex;  
union  
\{  
LIST\_ENTRY HashLinks;  
struct  
\{  
PVOID SectionPointer;  
ULONG CheckSum;  
\};  
\};  
ULONG TimeDateStamp;  
  
\} LDR\_DATA\_TABLE\_ENTRY, \*PLDR\_DATA\_TABLE\_ENTRY;

///

xp下

0:000> dt \_peb 7ffde000  
ntdll!\_PEB  
\+0x000 InheritedAddressSpace : 0 ''  
\+0x001 ReadImageFileExecOptions : 0 ''  
\+0x002 BeingDebugged : 0x1 ''  
\+0x003 SpareBool : 0 ''  
\+0x004 Mutant : 0xffffffff  
\+0x008 ImageBaseAddress : 0x00400000  
\+0x00c Ldr : 0x00251ea0 \_PEB\_LDR\_DATA  
\+0x010 ProcessParameters : 0x00020000 \_RTL\_USER\_PROCESS\_PARAMETERS  
\+0x014 SubSystemData : (null)  
\+0x018 ProcessHeap : 0x00150000  
\+0x01c FastPebLock : 0x7c9a0620 \_RTL\_CRITICAL\_SECTION  
\+0x020 FastPebLockRoutine : 0x7c921000  
\+0x024 FastPebUnlockRoutine : 0x7c9210e0  
\+0x028 EnvironmentUpdateCount : 1  
//.............

0:000> dt \_PEB\_LDR\_DATA 0x00251ea0   
ntdll!\_PEB\_LDR\_DATA  
\+0x000 Length : 0x28  
\+0x004 Initialized : 0x1 ''  
\+0x008 SsHandle : (null)  
\+0x00c InLoadOrderModuleList : \_LIST\_ENTRY \[ 0x251ee0 \- 0x252a80 \] //下面用到，指向一个 \_LDR\_DATA\_TABLE\_ENTRY的首地址  
\+0x014 InMemoryOrderModuleList : \_LIST\_ENTRY \[ 0x251ee8 \- 0x252a88 \] //下面用到，指向一个 \_LDR\_DATA\_TABLE\_ENTRY的InMemoryOrderLinks地址  
\+0x01c InInitializationOrderModuleList : \_LIST\_ENTRY \[  0x251f58 \- 0x2529d0 \] //下面用到，指向一个 \_LDR\_DATA\_TABLE\_ENTRY的InInitializationOrderLinks地址  
\+0x024 EntryInProgress : (null)  
0:000> dt \_LDR\_DATA\_TABLE\_ENTRY 0x251ee0   
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x251f48 \- 0x251eac \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x251f50 \- 0x251eb4 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x0 - 0x0 \]  
\+0x018 DllBase : 0x00400000  
\+0x01c EntryPoint : 0x00415667  
\+0x020 SizeOfImage : 0x88000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\Documents and Settings\\Administrator\\桌面\\Dbgview.exe"  
\+0x02c BaseDllName : \_UNICODE\_STRING "Dbgview.exe"  
\+0x034 Flags : 0x5000  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e298 - 0x7c99e298 \]  
\+0x03c SectionPointer : 0x7c99e298  
\+0x040 CheckSum : 0x7c99e298  
\+0x044 TimeDateStamp : 0x4ddfd5aa  
\+0x044 LoadedImports : 0x4ddfd5aa  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)  
0:000> dt \_LDR\_DATA\_TABLE\_ENTRY 0x251f48   
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x252010 - 0x251ee0 \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x252018 - 0x251ee8 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x252020 - 0x251ebc \]  
\+0x018 DllBase : 0x7c920000  
\+0x01c EntryPoint : 0x7c9320f8  
\+0x020 SizeOfImage : 0x96000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\WINDOWS\\system32\\ntdll.dll"  
\+0x02c BaseDllName : \_UNICODE\_STRING "ntdll.dll"  
\+0x034 Flags : 0x85004  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e2e8 - 0x7c99e2e8 \]  
\+0x03c SectionPointer : 0x7c99e2e8  
\+0x040 CheckSum : 0x7c99e2e8  
\+0x044 TimeDateStamp : 0x4d00f280  
\+0x044 LoadedImports : 0x4d00f280  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)  
0:000> dt \_LDR\_DATA\_TABLE\_ENTRY0x251ee8-0x8 //(计算根据偏移得到首地址)  
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x251f48 - 0x251eac \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x251f50 - 0x251eb4 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x0 - 0x0 \]  
\+0x018 DllBase : 0x00400000  
\+0x01c EntryPoint : 0x00415667  
\+0x020 SizeOfImage : 0x88000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\Documents and Settings\\Administrator\\桌面\\Dbgview.exe"  
\+0x02c BaseDllName : \_UNICODE\_STRING "Dbgview.exe"  
\+0x034 Flags : 0x5000  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e298 - 0x7c99e298 \]  
\+0x03c SectionPointer : 0x7c99e298  
\+0x040 CheckSum : 0x7c99e298  
\+0x044 TimeDateStamp : 0x4ddfd5aa  
\+0x044 LoadedImports : 0x4ddfd5aa  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)

0:000> dt \_LDR\_DATA\_TABLE\_ENTRY 0x251f50-0x8  //(计算根据偏移得到首地址)  
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x252010 - 0x251ee0 \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x252018 - 0x251ee8 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x252020 - 0x251ebc \]  
\+0x018 DllBase : 0x7c920000  
\+0x01c EntryPoint : 0x7c9320f8  
\+0x020 SizeOfImage : 0x96000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\WINDOWS\\system32\\ntdll.dll"  
\+0x02c BaseDllName : \_UNICODE\_STRING "ntdll.dll"  
\+0x034 Flags : 0x85004  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e2e8 - 0x7c99e2e8 \]  
\+0x03c SectionPointer : 0x7c99e2e8  
\+0x040 CheckSum : 0x7c99e2e8  
\+0x044 TimeDateStamp : 0x4d00f280  
\+0x044 LoadedImports : 0x4d00f280  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)  
0:000> dt \_LDR\_DATA\_TABLE\_ENTRY 0x251f58-0x10  
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x252010 - 0x251ee0 \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x252018 - 0x251ee8 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x252020 - 0x251ebc \]  
\+0x018 DllBase : 0x7c920000  
\+0x01c EntryPoint : 0x7c9320f8  
\+0x020 SizeOfImage : 0x96000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\WINDOWS\\system32\\ntdll.dll"  
\+0x02c BaseDllName : \_UNICODE\_STRING "ntdll.dll"  
\+0x034 Flags : 0x85004  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e2e8 - 0x7c99e2e8 \]  
\+0x03c SectionPointer : 0x7c99e2e8  
\+0x040 CheckSum : 0x7c99e2e8  
\+0x044 TimeDateStamp : 0x4d00f280  
\+0x044 LoadedImports : 0x4d00f280  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)  
0:000> dt \_LDR\_DATA\_TABLE\_ENTRY 0x252020-0x10  
ntdll!\_LDR\_DATA\_TABLE\_ENTRY  
\+0x000 InLoadOrderLinks : \_LIST\_ENTRY \[ 0x2520d0 - 0x251f48 \]  
\+0x008 InMemoryOrderLinks : \_LIST\_ENTRY \[ 0x2520d8 - 0x251f50 \]  
\+0x010 InInitializationOrderLinks : \_LIST\_ENTRY \[ 0x252328 - 0x251f58 \]  
\+0x018 DllBase : 0x7c800000  
\+0x01c EntryPoint : 0x7c80b64e  
\+0x020 SizeOfImage : 0x11e000  
\+0x024 FullDllName : \_UNICODE\_STRING "C:\\WINDOWS\\system32\\kernel32.dll"  
\+0x02c BaseDllName : \_UNICODE\_STRING "kernel32.dll"  
\+0x034 Flags : 0x85004  
\+0x038 LoadCount : 0xffff  
\+0x03a TlsIndex : 0  
\+0x03c HashLinks : \_LIST\_ENTRY \[ 0x7c99e2d0 - 0x7c99e2d0 \]  
\+0x03c SectionPointer : 0x7c99e2d0  
\+0x040 CheckSum : 0x7c99e2d0  
\+0x044 TimeDateStamp : 0x506bc5dd  
\+0x044 LoadedImports : 0x506bc5dd  
\+0x048 EntryPointActivationContext : (null)  
\+0x04c PatchInformation : (null)

///

win7下 上面windbg 手工方式一样，只是运行结果略有一同，下面给出程序 实现的方式。

VOID GetPebModule()
    {
    	PBYTE pPeb;
    	PPEB_LDR_DATA pLdr , tttt;
    	PLDR_DATA_TABLE_ENTRY pLdrData;
    
    	__asm
    	{
    		MOV EAX, FS:[0x18]
    		MOV EAX, [EAX + 0x30]
    
    		MOV pPeb, EAX  
    	}
    
    	pLdr = (PPEB_LDR_DATA)(*(DWORD*)(pPeb + 0x0C));
    
    	tttt = pLdr;
    
    	printf("\nInLoadOrderModuleList:\n");
    
    	pLdrData = (PLDR_DATA_TABLE_ENTRY)pLdr->InLoadOrderModuleList.Flink;
    
    	for ( ; (pLdr->InLoadOrderModuleList.Flink) != (pLdrData->InLoadOrderLinks.Flink); )
    	{
    		wprintf(L"%s\r\n", (pLdrData->FullDllName.Buffer));
    		wprintf(L"%s\r\n", (pLdrData->BaseDllName.Buffer));
    		pLdrData = (PLDR_DATA_TABLE_ENTRY)(pLdrData->InLoadOrderLinks.Flink);
    	}
    
    
    	printf("\n\nInInitializationOrderModuleList:\n");
    
    	pLdr = tttt;
    
    	pLdrData = (PLDR_DATA_TABLE_ENTRY)CONTAINING__RECORD(tttt->InInitializationOrderModuleList.Flink, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
    
    	for ( ; (tttt->InInitializationOrderModuleList.Flink) != (pLdrData->InInitializationOrderLinks.Flink); )
    	{
    		wprintf(L"%s\r\n", (pLdrData->FullDllName.Buffer));
    		wprintf(L"%s\r\n", (pLdrData->BaseDllName.Buffer));
    		pLdrData = (PLDR_DATA_TABLE_ENTRY)CONTAINING__RECORD(pLdrData->InInitializationOrderLinks.Flink, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
    
    	}
    
    	printf("\n\nInMemoryOrderModuleList:\n");
    	pLdrData = (PLDR_DATA_TABLE_ENTRY)CONTAINING__RECORD(pLdr->InMemoryOrderModuleList.Flink, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
    
    	for ( ; (pLdr->InMemoryOrderModuleList.Flink) != (pLdrData->InMemoryOrderLinks.Flink); )
    	{
    		wprintf(L"%s\r\n", (pLdrData->FullDllName.Buffer));
    		wprintf(L"%s\r\n", (pLdrData->BaseDllName.Buffer));
    		pLdrData = (PLDR_DATA_TABLE_ENTRY)CONTAINING__RECORD(pLdrData->InMemoryOrderLinks.Flink, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
    
    	}
    
    	return ;
    }

/\*

输出：

nInLoadOrderModuleList:

C:\\Windows\\SYSTEM32\\ntdll.dll  
ntdll.dll  
C:\\Windows\\system32\\kernel32.dll  
kernel32.dll  
C:\\Windows\\system32\\KERNELBASE.dll  
KERNELBASE.dll

InInitializationOrderModuleList:  
C:\\Windows\\SYSTEM32\\ntdll.dll  
ntdll.dll  
C:\\Windows\\system32\\KERNELBASE.dll  
KERNELBASE.dll  
C:\\Windows\\system32\\kernel32.dll  
kernel32.dll

InMemoryOrderModuleList:  
d:\\Desktop\\HsdaosUI\\Hsdaos\\trunk\\Bin\\Vstest.exe  
Vstest.exe  
C:\\Windows\\SYSTEM32\\ntdll.dll  
ntdll.dll  
C:\\Windows\\system32\\kernel32.dll  
kernel32.dll  
C:\\Windows\\system32\\KERNELBASE.dll  
KERNELBASE.dll

\*/

///

用shellcode获取Kernel32基地址的几种方法

win7下

\_\_asm  
\{  
push eax  
mov eax, fs:\[30h\] //PEB 址, mov eax, fs:\[18h\] 这个获得TEB地址  
mov eax, \[eax + 0Ch\]  
mov eax, \[eax + 1Ch\]  
mov eax, \[eax\]  
mov eax, \[eax\]  
mov eax, \[eax + 8\]  
mov hModule, eax  
pop eax  
\}

mov eax, fs:\[0\] //为\_EXCEPTION\_REGISTRATION\_RECORD的地址，exceptionList

\_\_asm  
\{  
push eax  
mov eax, fs:\[18h\] //TEB地址

mov eax, \[eax + 30h \] //PEB地址  
mov eax, \[eax + 0Ch\]  
mov eax, \[eax + 1Ch\]  
mov eax, \[eax\]  
mov eax, \[eax\]  
mov eax, \[eax + 8\]  
mov hModule, eax  
pop eax  
\}

XP 下

\_\_asm  
\{  
push eax  
mov eax, fs:\[30h\]  
mov eax, \[eax + 0Ch\]  
mov eax, \[eax + 1Ch\]  
mov eax, \[eax\]  
mov eax, \[eax + 8\]  
mov hModule, eax  
pop eax  
\}

1、CreateProcess函数在完成装载应用程序后，会先将一个返回地址压入到堆栈顶端，而这个返回地址恰好在Kernel32.dll中，利用这个原理我们可以顺着这个返回地址按64KB大小往地址搜索，那么我们一定可以找到Kernel32模块的基地址，废话少说，代码如下：

GetK32Base:  
mov eax, \[esp+04h\] ;得到kernel32的返回地址  
and eax, ffff0000h  
Search:  
cmp WORD ptr \[eax\], IMAGE\_DOS\_SIGNATURE ;判断是否为ImageBase  
jnz @f  
mov edx, \[eax+3ch\]  
add edx, eax  
cmp WORD ptr \[edx\], IMAGE\_NT\_SIGNATURE ;判断是否为PE头  
jnz @f  
ret  
@@:  
dec eax ;按64KB递减搜索  
xor ax, ax  
cmp eax, 70000000h  
ja Search  
ret

2、通过PEB枚举当前进程空间中用户模块列表也可以获取Kernel32模块的基地址，fs:\[0\]指向TEB，fs:\[30h\]指向PEB，PEB偏移0ch是LDR指针，以下可以分别通过加载顺序、内存顺序、初始化顺序获取Kernel32模块的基地址，这里以初始化顺序为例：

未公开的LDR\_MODULE数据结构如下：

typedef struct \_LDR\_MODULE  
\{  
LIST\_ENTRY InLoadOrderModuleList; // +0x00  
LIST\_ENTRY InMemoryOrderModuleList; // +0x08  
LIST\_ENTRY InInitializationOrderModuleList; // +0x10  
PVOID BaseAddress; // +0x18  
PVOID EntryPoint; // +0x1c  
ULONG SizeOfImage; // +0x20  
UNICODE\_STRING FullDllName; // +0x24  
UNICODE\_STRING BaseDllName; // +0x2c  
ULONG Flags; // +0x34  
SHORT LoadCount; // +0x38  
SHORT TlsIndex; // +0x3a  
LIST\_ENTRY HashTableEntry; // +0x3c  
ULONG TimeDateStamp; // +0x44  
// +0x48  
\} LDR\_MODULE, \*PLDR\_MODULE;

以下是WinDbg显示的PEB\_LDR\_DATA的数据结构

\+0x00c Ldr : Ptr32 to struct \_PEB\_LDR\_DATA, 7 elements, 0x28 bytes  
\+0x000 Length : Uint4B  
\+0x004 Initialized : UChar  
\+0x008 SsHandle : Ptr32 to Void  
\+0x00c InLoadOrderModuleList : struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x000 Flink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x004 Blink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x014 InMemoryOrderModuleList : struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x000 Flink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x004 Blink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x01c InInitializationOrderModuleList : struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x000 Flink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x004 Blink : Ptr32 to struct \_LIST\_ENTRY, 2 elements, 0x8 bytes  
\+0x024 EntryInProgress : Ptr32 to Void

通过上面两个结构我们可以通过3种方式获取Kernel32模块的基地址

1)加载顺序的方式：

GetK32Base：  
assume fs:nothing  
push esi  
xor eax,eax  
mov eax,fs:\[eax+30h\] ;指向PEB的指针  
mov eax,\[eax+0ch\] ;指向PEB\_LDR\_DATA的指针  
mov esi,\[eax+0ch\] ;根据PEB\_LDR\_DATA得出InLoadOrderModuleList的Flink字段  
lodsd  
mov eax, \[eax\] ;指向下一个节点  
mov eax,\[eax+18h\] ;Kernel.dll的基地址  
pop esi  
ret

2)内存顺序的方式：

GetK32Base：  
assume fs:nothing  
push esi  
xor eax,eax  
mov eax,fs:\[eax+30h\] ;指向PEB的指针  
mov eax,\[eax+0ch\] ;指向PEB\_LDR\_DATA的指针  
mov esi,\[eax+14h\] ;根据PEB\_LDR\_DATA得出InMemoryOrderModuleList的Flink字段  
lodsd  
mov eax, \[eax\] ;指向下一个节点  
mov eax,\[eax+10h\] ;Kernel.dll的基地址  
pop esi  
ret

3)初始化顺序的方式：

GetK32Base：  
assume fs:nothing  
push esi  
xor eax,eax  
mov eax,fs:\[eax+30h\] ;指向PEB的指针  
mov eax,\[eax+0ch\] ;指向PEB\_LDR\_DATA的指针  
mov esi,\[eax+1ch\] ;根据PEB\_LDR\_DATA得出InInitializationOrderModuleList的Flink字段  
lodsd  
mov eax,\[eax+08h\] ;Kernel.dll的基地址  
pop esi  
ret

3、通过遍历SEH链的方法，在SEH链中查找成员prev的值为0xFFFFFFFFh的EXCEPTION\_REGISTER结构。该结构中的handler值是系统异常处理例程，总是位于kernerl32.dll中。当前线程的TIB保存在fs段选择器指定的数据段的0偏移处，所以fs:\[0\] 的地方就是TIB结构中的ExceptionList字段。而ExceptionList指向一个EXCEPTION\_REGISTRATION结构，SEH异常处理回调函数的入口地址就是由EXCEPTION\_REGISTRATION结构指定。

TIB结构如下：

NT\_TIB STRUCT  
ExceptionList dd ?  
StackBase dd ?  
StackLimit dd ?  
SubSystemTib dd ?  
union  
FiberData dd ?  
Version dd ?  
ends  
ArbitraryUserPointer dd ?  
Self dd ?  
NT\_TIB ENDS  
  
EXCEPTION\_REGISTRATION STRUCT  
prev dd ? ;前一个EXCEPTION\_REGISTRATION结构的地址  
handler dd ? ;异常处理回调函数地址  
EXCEPTION\_REGISTRATION ends

GetK32Base：  
assume fs:nothing  
xor esi, esi  
mov esi, fs:\[esi\]  
lodsd  
@@:  
inc eax  
jz @f  
dec eax  
xchg esi, eax  
lodsd  
jmp @b  
@@:  
lodsd  
@@:  
dec eax  
xor ax, ax  
cmp DWORD ptr \[eax\], 5A4D  
jnz @b  
ret

结束语：技术可以做正义的事，也可以做邪恶的事，关键是看什么人掌握这些技术