添加节操作的思路实现

添加一个节 需要修改的数据

1 添加一个新的节 (copy一份)
2 在新增节的后安眠, 填充40个00
3 修改pe头中节的 数量
4 修改SizeOfImage的大小
5 在原有的数据的最后,新增一个节的数据,(内存对齐的整数倍)
6 修正增加的节的属性



手动新增一个节表和节  保证修改后的程序能正常运行

编程实现,新增一个节, 病添加代码

编程实现,扩大最后一个节,并添加代码



测试代码,写的很垃圾, 可用, 不过,不推荐大家使用


void TestAddSecToFile(LPSTR lpszFile)
{
	LPVOID pFileBuffer = NULL;
	pFileBuffer= ReadPEFile(lpszFile);
	if(!pFileBuffer)
	{
		printf("文件读取失败\n");
		return;
	}
	
	PIMAGE_DOS_HEADER pDosHeader = NULL;
	PIMAGE_NT_HEADERS pNTHeader = NULL;
	PIMAGE_FILE_HEADER pPEHeader = NULL;
	PIMAGE_OPTIONAL_HEADER32 pOptionHeader = NULL;
	PIMAGE_SECTION_HEADER pSectionHeader = NULL;
	PIMAGE_SECTION_HEADER pSectionHeader_ADD = NULL;

	//Header信息
	pDosHeader = (PIMAGE_DOS_HEADER)pFileBuffer;
	pNTHeader = (PIMAGE_NT_HEADERS)((DWORD)pFileBuffer+pDosHeader->e_lfanew);
	pPEHeader = (PIMAGE_FILE_HEADER)(((DWORD)pNTHeader)+4);
	pOptionHeader = (PIMAGE_OPTIONAL_HEADER32)((DWORD)pPEHeader+IMAGE_SIZEOF_FILE_HEADER);
	pSectionHeader = (PIMAGE_SECTION_HEADER)((DWORD)pOptionHeader+pPEHeader->SizeOfOptionalHeader);
	pSectionHeader_ADD = pSectionHeader;
	

	//1 判断能否添加节
	DWORD Header_size = pDosHeader->e_lfanew + 4 + 20 + pPEHeader->SizeOfOptionalHeader + pPEHeader->NumberOfSections*40;
	if(pOptionHeader->SizeOfHeaders-Header_size<80)
	{
		printf("没有可用空间填充节表\n");
		free(pFileBuffer);
		return;
	}
	
	printf("空间:%d\n",pOptionHeader->SizeOfHeaders-Header_size);
	
	

	//添加一个节
	//确定参数
	PIMAGE_SECTION_HEADER pSectionHeader_LAST = (PIMAGE_SECTION_HEADER)((DWORD)pSectionHeader+(pPEHeader->NumberOfSections-1)*40);
	pSectionHeader_ADD=(PIMAGE_SECTION_HEADER)((DWORD)pSectionHeader_ADD+(pPEHeader->NumberOfSections)*40);
	//="NewSec";
	strcpy((char*)pSectionHeader_ADD->Name,"NewSec");
	pSectionHeader_ADD->Misc.VirtualSize = 0x1000;
	pSectionHeader_ADD->VirtualAddress = pOptionHeader->SizeOfImage;
	pSectionHeader_ADD->SizeOfRawData = 0x1000;
	pSectionHeader_ADD->PointerToRawData = pSectionHeader_LAST->PointerToRawData+pSectionHeader_LAST->SizeOfRawData;
	pSectionHeader_ADD->Characteristics = pSectionHeader->Characteristics;

	//填充0
	LPVOID pSectionEND = (LPVOID)((DWORD)pSectionHeader_ADD+40);
	memset(pSectionEND,0,IMAGE_SIZEOF_SECTION_HEADER);
	

	printf("pFileBuffer: %x\n",pFileBuffer);
	printf("pSectionHeader: %x\n",pSectionHeader);
	printf("pSectionHeader_LAST: %x\n",pSectionHeader_LAST);
	printf("pSectionHeader_ADD: %x\n",pSectionHeader_ADD);
	printf("pSectionEND: %x\n",pSectionEND);
	
	//修改PE头信息
	pPEHeader->NumberOfSections = pPEHeader->NumberOfSections +1;
	pOptionHeader->SizeOfImage  = pOptionHeader->SizeOfImage+0x1000;

	//写入到文件
	FILE *pOutFile = NULL;	
	//打开文件
	pOutFile = fopen("C://addSec.exe","a+b");
	
	if(!pOutFile)
	{
		printf("无法打开文件EXE文件");
		return;
	}
	//写出第一部分
	printf("length: %x \n ",pSectionHeader_ADD->PointerToRawData+pSectionHeader_ADD->SizeOfRawData);

	size_t writeSize = fwrite(pFileBuffer,pSectionHeader_ADD->PointerToRawData,1,pOutFile);
	printf("WirteSize:%d\n",writeSize);
	//写出第二部分
	LPVOID pNewBuffer=(LPVOID)malloc(0x1000);
	if(pNewBuffer==NULL)
	{
		printf("pNewBuffer分配空间失败\n");
		return;
	}
	memset(pNewBuffer,0,0x1000);
	writeSize = fwrite(pNewBuffer,0x1000,1,pOutFile);
	
	//关闭文件
	fclose(pOutFile);
	


	free(pFileBuffer);
	free(pNewBuffer);

}

原文链接: 添加节操作的思路实现 版权所有,转载时请注明出处,违者必究。
注明出处格式:流沙 ( https://gyarmy.com/post-302.html )

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2则评论给“添加节操作的思路实现”

  1. loc

    看懂了哥,你这是按照滴水逆向三期视频里面的顺序来做题的 非常感谢啦

    回复
    • 流沙

      @loc:对的, 是按照滴水的课程学习操作的!

      回复