在PE中，新增节，添加代码

// mem.cpp : 定义控制台应用程序的入口点。
//PE文件从文件加载到内存，再从内存读取，然后存盘到文件#include "stdafx.h"
#include <windows.h>
#include <winnt.h>//#define PATH "C:\\Windows\\System32\\notepad.exe"
#define PATH "C:\\Users\\Administrator\\Desktop\\ipmsg.exe"
#define MsgADD 0x75cffde6
char Shellcode[] =
{
0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x00,
0xE8, 0x00, 0x00, 0x00, 0x00,
0xE9, 0x00, 0x00, 0x00, 0x00
};int Filelength(FILE *fp);
int _tmain(int argc, _TCHAR* argv[])
{
FILE *Fp;
fopen_s(&Fp, PATH, "rb");
int FileSize = Filelength(Fp);//获取文件大小
char * FileBuffer = (char *)malloc(FileSize);//申请存放文件的内存空间
if (FileBuffer == NULL)
{
printf("申请iImageBuffer失败");
}
fread_s(FileBuffer, FileSize, 1, FileSize, Fp); //将文件复制到内存中
//定位一下内存中的数据 各个头表
//定位标准PE头
PIMAGE_FILE_HEADER MyFileHeader;
MyFileHeader = (PIMAGE_FILE_HEADER)(char *)(FileBuffer + *(int *)(FileBuffer + 0x3c) + 0x4);
//定位可选PE头
PIMAGE_OPTIONAL_HEADER MyOptionalHeader;
MyOptionalHeader = (PIMAGE_OPTIONAL_HEADER)((char *)MyFileHeader + 0x14);
//定位节表
PIMAGE_SECTION_HEADER MySectionHeader;
MySectionHeader = (PIMAGE_SECTION_HEADER)((char *)MyOptionalHeader + MyFileHeader->SizeOfOptionalHeader);//拉伸，也就是读到内存中的状态
char * ImageBuffer = (char *)malloc(MyOptionalHeader->SizeOfImage+0x1000);//给拉伸申请内存空间
ZeroMemory(ImageBuffer, MyOptionalHeader->SizeOfImage+0x1000);if (ImageBuffer == NULL)
{
printf("申请iImageBuffer失败");
}
memcpy(ImageBuffer, FileBuffer, MyOptionalHeader->SizeOfHeaders);for (int i = 0; i < MyFileHeader->NumberOfSections; i++)
{
memcpy(ImageBuffer + MySectionHeader->VirtualAddress, FileBuffer + MySectionHeader->PointerToRawData, MySectionHeader->SizeOfRawData);//
MySectionHeader++;
}
//新增节开始
PIMAGE_SECTION_HEADER AddSectionHeader;
AddSectionHeader = MySectionHeader;
MySectionHeader--;
//AddSectionHeader->Name = "cyp";
//AddSectionHeader->Name = { 0 };
AddSectionHeader->Name[0] = '.'; AddSectionHeader->Name[1] = 'c'; AddSectionHeader->Name[2] = 'y'; AddSectionHeader->Name[3] = 'p';
AddSectionHeader->Misc.VirtualSize = 0x1000;
AddSectionHeader->VirtualAddress = MySectionHeader->VirtualAddress + MySectionHeader->SizeOfRawData;
AddSectionHeader->SizeOfRawData = 0x1000;
AddSectionHeader->PointerToRawData = MySectionHeader->PointerToRawData + MySectionHeader->SizeOfRawData;
int x = (MySectionHeader - (MyFileHeader->NumberOfSections-1))->Characteristics;
AddSectionHeader->Characteristics = x;
MyFileHeader->NumberOfSections += 1;
MyOptionalHeader->SizeOfImage + 0x1000;
//新增节结束//添加代码到PE中
MyFileHeader = (PIMAGE_FILE_HEADER)(char *)(ImageBuffer + *(int *)(ImageBuffer + 0x3c) + 0x4);
MyOptionalHeader = (PIMAGE_OPTIONAL_HEADER)((char *)MyFileHeader + 0x14);
MySectionHeader = (PIMAGE_SECTION_HEADER)((char *)MyOptionalHeader + MyFileHeader->SizeOfOptionalHeader);//重新指一下，前面动过了//E8后面的硬编码地址 ＝真正要到的地址 - E8的下一行或E8本行 +0x5
char *CodeAdd = ImageBuffer + MySectionHeader->VirtualAddress + MySectionHeader->Misc.VirtualSize;//为要增加的代码确定位置
memcpy(CodeAdd, Shellcode, sizeof(Shellcode));//把硬编码复制到指定位置
int CallAdd = MsgADD - (MyOptionalHeader->ImageBase + ((int)(CodeAdd + 0xd) - (int)ImageBuffer));
*(int *)(CodeAdd + 0x9) = CallAdd;//定位CALL函数位置
int JmpAdd = MyOptionalHeader->ImageBase + MyOptionalHeader->AddressOfEntryPoint - (MyOptionalHeader->ImageBase + (CodeAdd + 0xd - ImageBuffer));//前面是真正要跳的地址 后面括号是下一条指令的地址
*(int *)(CodeAdd + 0xe) = JmpAdd;//定位JMP 跳回位置，也就是修改程序入口
MyOptionalHeader->AddressOfEntryPoint = CodeAdd - ImageBuffer;//重新定位程序入口处//添加代码到PE结束//压缩，为存盘做准备
char *NewBuffer = (char *)malloc(FileSize+0x1000);//给压缩申请内存空间
if (NewBuffer == NULL)
{
printf("申请iImageBuffer失败");
}
memcpy(NewBuffer, ImageBuffer, MyOptionalHeader->SizeOfHeaders);
MySectionHeader = (PIMAGE_SECTION_HEADER)((char *)MyOptionalHeader + MyFileHeader->SizeOfOptionalHeader);//重新指一下，前面动过了for (int i = 0; i < MyFileHeader->NumberOfSections; i++)
{
memcpy(NewBuffer + MySectionHeader->PointerToRawData, ImageBuffer + MySectionHeader->VirtualAddress, MySectionHeader->SizeOfRawData);
MySectionHeader++;
}
FILE *nFp;
fopen_s(&nFp, "C:\\Users\\Administrator\\Desktop\\CYP.exe", "wb");
fwrite(NewBuffer, FileSize, 1, nFp);//getchar();
fclose(nFp);
free(FileBuffer);
free(ImageBuffer);
free(NewBuffer);
return 0;
}//获取文件大小int Filelength(FILE *fp)
{
int num;
fseek(fp, 0, SEEK_END);
num = ftell(fp);
fseek(fp, 0, SEEK_SET);
return num;
}