Windows x64 platform to obtain PEB table, and get kernel32.dll base address, function and get it

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/Giser_D/article/details/90718842

Reference: https://www.cnblogs.com/aliflycoris/p/5185097.html

And another blogger 

 

Man of few words said, that is entered:

 

The first is to obtain the base address of PEB, come to understand how the assembly code in 64-bit embedded platforms: The reference bloggers https://blog.csdn.net/Giser_D/article/details/90670974

Assembly code:

.CODE
  GetPeb PROC
    mov rax,gs:[60h]
  ret
  GetPeb ENDP
 END

External reference header file:

extern "C" PVOID64 _cdecl GetPeb();

Then get Kernel32 base address:

HMODULE getKernel32Address()
{
	PVOID64 Peb = GetPeb();
	PVOID64 LDR_DATA_Addr = *(PVOID64**)((BYTE*)Peb+0x018);  //0x018是LDR相对于PEB偏移   存放着LDR的基地址
	UNICODE_STRING* FullName; 
	HMODULE hKernel32 = NULL;
	LIST_ENTRY* pNode = NULL;
	pNode =(LIST_ENTRY*)(*(PVOID64**)((BYTE*)LDR_DATA_Addr+0x30));  //偏移到InInitializationOrderModuleList
	while(true)
	{
		FullName = (UNICODE_STRING*)((BYTE*)pNode+0x38);//BaseDllName基于InInitialzationOrderModuList的偏移
		if(*(FullName->Buffer+12)=='\0')
		{
			hKernel32 = (HMODULE)(*((ULONG64*)((BYTE*)pNode+0x10)));//DllBase
			break;
		}
		pNode = pNode->Flink;
	}
	return hKernel32;
}

 

Then is the address, the name of the function obtained by the method above, obtaining an address corresponding to the function:

PVOID GetAddressFromExportTable(PVOID pBaseAddress, PCHAR pszFunctionName)
{
	PVOID get_address;
	ULONG ulFunctionIndex = 0;
	// Dos Header
	PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)pBaseAddress;
	// NT Header
	PIMAGE_NT_HEADERS pNtHeaders = (PIMAGE_NT_HEADERS)((PUCHAR)pDosHeader + pDosHeader->e_lfanew);
	// Export Table
	PIMAGE_EXPORT_DIRECTORY pExportTable = (PIMAGE_EXPORT_DIRECTORY)((PUCHAR)pDosHeader + pNtHeaders->OptionalHeader.DataDirectory[0].VirtualAddress);
	// 有名称的导出函数个数
	ULONG ulNumberOfNames = pExportTable->NumberOfNames;
	// 导出函数名称地址表
	PULONG lpNameArray = (PULONG)((PUCHAR)pDosHeader + pExportTable->AddressOfNames);
	PCHAR lpName = NULL;
	// 开始遍历导出表
	for (ULONG i = 0; i < ulNumberOfNames; i++)
	{
		lpName = (PCHAR)((PUCHAR)pDosHeader + lpNameArray[i]);
		// 判断是否查找的函数
		if (0 == _strnicmp(pszFunctionName, lpName, strlen(pszFunctionName)))
		{
			// 获取导出函数地址
			USHORT uHint = *(USHORT *)((PUCHAR)pDosHeader + pExportTable->AddressOfNameOrdinals + 2 * i);
			ULONG ulFuncAddr = *(PULONG)((PUCHAR)pDosHeader + pExportTable->AddressOfFunctions + 4 * uHint);
			get_address = (PVOID)((PUCHAR)pDosHeader + ulFuncAddr);
			break;
		}
	}
	return get_address;
}

ok, I want to help, not to speak carefully, but can be used directly. For 64-bit platforms, remember!

Kernel32.dll function of ExitThread address GetAddressFromExportTable is obtained with the actual margin of error, the specific cause is not known, is not recommended!