[C] 纯文本查看 复制代码
#include "iostream"
#include <windows.h>
#define size_shellcode 0x12
#define messagebox_add 0x77d507ea
BYTE shellcode[] = {
0x6A,00,0x6A,00,0x6A,00,0x6A,00,
0XE8,00,00,00,00,
0XE9,00,00,00,00
};
char file_path[] = "C:\\WINDOWS\\system32\\notepad.exe";
char write_file_path[] = "C:\\notepad1.exe";
// exe->filebuffer 返回值为计算所得文件大小
int ReadPEFile(char* file_path,PVOID* pFileBuffer)
{
FILE* pfile = NULL; // 文件指针
DWORD file_size = 0;
LPVOID pTempFilebuffer = NULL;
// 打开文件
pfile = fopen(file_path,"rb"); // 如果有新的指针，就要进行判断
if(!pfile)
{
printf("打开exe文件失败！\n");//如果分配失败就要关闭文件、释放动态内存、指针指向NULL
return 0;
}
// 读取文件大小
fseek(pfile,0,SEEK_END);
file_size = ftell(pfile);
fseek(pfile,0,SEEK_SET);
// 分配空间
pTempFilebuffer = malloc(file_size); // 如果有新的指针，就要进行判断
if(!pTempFilebuffer)
{
printf("分配空间失败！\n");//如果分配失败就要关闭文件、释放动态内存、指针指向NULL
fclose(pfile);
return 0 ;
}
// 将数据读取到内存中
size_t n = fread(pTempFilebuffer,file_size,1,pfile);
if(!n)
{
printf("数据读取到内存中失败！\n"); //如果分配失败就要关闭文件、释放动态内存、指针指向NULL
fclose(pfile);
free(pTempFilebuffer);
return 0 ;
}
// 关闭文件(已经读取到内存了)
*pFileBuffer = pTempFilebuffer;
pTempFilebuffer = NULL;
fclose(pfile);
return file_size;
}
// filebuffer -> imagebuffer
DWORD CopyFileBufferToImageBuffer(PVOID pFileBuffer,PVOID* pImageBuffer)
{
// 初始化PE头部结构体
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;
// 初始化IMAGE_BUFFER指针(temparay)
LPVOID pTempImagebuffer = NULL;
if(!pFileBuffer)
{
printf("(2pimagebuffer阶段)读取到内存的pfilebuffer无效！\n");
return 0 ;
}
// 判断是否是可执行文件
if(*((PWORD)pFileBuffer) != IMAGE_DOS_SIGNATURE) // IMAGE_DOS_SIGNATURE是4字节，将pFileBuffer强制类型转换为4字节指针类型（PWORD）
{
printf("(2pimagebuffer阶段)不含MZ标志，不是exe文件！\n");
return 0;
}
//强制结构体类型转换pDosHeader
pDosHeader = PIMAGE_DOS_HEADER(pFileBuffer);
//判断是否含有PE标志
if(*((PDWORD)((DWORD)pFileBuffer+pDosHeader->e_lfanew)) != IMAGE_NT_SIGNATURE) // 注意指针的加法是：去掉一个*后的类型相加。必须转换为DWORD类型再加减。
{ //相加后的和 强制类型转换为4字节指针类型（PWORD） IMAGE_NT_SIGNATURE 4BYTES
printf("(2pimagebuffer阶段)不是有效的PE标志！\n");
return 0;
}
// 强制结构体类型转换
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);
// 分配动态内存
pTempImagebuffer = malloc(pOptionHeader->SizeOfImage);
if(!pTempImagebuffer)
{
printf("分配动态内存失败！\n");
free(pTempImagebuffer);
return 0;
}
// 初始化动态内存
memset(pTempImagebuffer,0,pOptionHeader->SizeOfImage);
// 拷贝头部
memcpy(pTempImagebuffer,pDosHeader,pOptionHeader->SizeOfHeaders);
// 循环拷贝节表
PIMAGE_SECTION_HEADER pTempSectionHeader = pSectionHeader;
for(DWORD i = 0;i<pPEHeader->NumberOfSections;i++,pTempSectionHeader++)
{
memcpy((void*)((DWORD)pTempImagebuffer+pTempSectionHeader->VirtualAddress),(void*)((DWORD)pFileBuffer+pTempSectionHeader->PointerToRawData),pTempSectionHeader->SizeOfRawData);
}
// 返回数据
*pImageBuffer = pTempImagebuffer;
pTempImagebuffer = NULL;
return pOptionHeader->SizeOfImage;
}
//imagebuffer->newbuffer
DWORD CopyImageBufferToNewBuffer(PVOID pImageBuffer,PVOID* pNewBuffer)
{
// 初始化PE头部结构体
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;
// 初始化NEW_BUFFER指针(temparay)
LPVOID pTempNewbuffer = NULL;
// 判断pImageBuffer是否有效
if(!pImageBuffer)
{
printf("(2pnewbuffer阶段)读取到内存的pimagebuffer无效！\n");
return 0;
}
//判断是不是exe文件
if(*((PWORD)pImageBuffer) != IMAGE_DOS_SIGNATURE)
{
printf("(2pnewbuffer阶段)不含MZ标志，不是exe文件！\n");
return 0;
}
// 强制结构体类型转换
pDosHeader = (PIMAGE_DOS_HEADER)pImageBuffer;
if(*((PDWORD)((DWORD)pImageBuffer+pDosHeader->e_lfanew)) != IMAGE_NT_SIGNATURE)
{
printf("(2pnewbuffer阶段)不是有效的PE标志！\n");
return 0;
}
// 强制结构体类型转换
pNTHeader = (PIMAGE_NT_HEADERS)((DWORD)pImageBuffer+pDosHeader->e_lfanew);
pPEHeader = (PIMAGE_FILE_HEADER)((DWORD)pNTHeader+4); // 这里必须强制类型转换
pOptionHeader = (PIMAGE_OPTIONAL_HEADER32)((DWORD)pPEHeader+IMAGE_SIZEOF_FILE_HEADER);
pSectionHeader = (PIMAGE_SECTION_HEADER)((DWORD)pOptionHeader+pPEHeader->SizeOfOptionalHeader);
//获取new_buffer的大小
int new_buffer_size = pOptionHeader->SizeOfHeaders;
for(DWORD i = 0;i<pPEHeader->NumberOfSections;i++)
{
new_buffer_size += pSectionHeader[i].SizeOfRawData; // pSectionHeader[i]另一种加法
}
// 分配内存（newbuffer）
pTempNewbuffer = malloc(new_buffer_size);
if(!pTempNewbuffer)
{
printf("(2pnewbuffer阶段)分配Newbuffer失败！\n");
return 0;
}
memset(pTempNewbuffer,0,new_buffer_size);
// 拷贝头部
memcpy(pTempNewbuffer,pDosHeader,pOptionHeader->SizeOfHeaders);
// 循环拷贝节区
PIMAGE_SECTION_HEADER pTempSectionHeader = pSectionHeader;
for(DWORD j = 0;j<pPEHeader->NumberOfSections;j++,pTempSectionHeader++)
{ //PointerToRawData节区在文件中的偏移,VirtualAddress节区在内存中的偏移地址,SizeOfRawData节在文件中对齐后的尺寸
memcpy((PDWORD)((DWORD)pTempNewbuffer+pTempSectionHeader->PointerToRawData),(PDWORD)((DWORD)pImageBuffer+pTempSectionHeader->VirtualAddress),pTempSectionHeader->SizeOfRawData);
}
//返回数据
*pNewBuffer = pTempNewbuffer; //暂存的数据传给参数后释放
pTempNewbuffer = NULL;
return new_buffer_size; // 返回计算得到的分配内存的大小
}
//newbuffer->存盘
int newbuffer_write2_exe(PVOID NewFileBuffer,DWORD FileSize, char* FilePath)
{
FILE* fp1 = fopen(FilePath,"wb");
if(fp1 != NULL)
{
fwrite(NewFileBuffer,FileSize,1,fp1);
}
fclose(fp1);
return 1;
}
int add_section(PVOID* pNewFileBuffer,PVOID pImageBuffer,DWORD FileSize)
{
// 初始化PE头部结构体
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;
// 判断pImageBuffer是否有效
if(!pImageBuffer)
{
printf("读取到内存的pfilebuffer无效！\n");
return 0;
}
//判断是不是exe文件
if(*((PWORD)pImageBuffer) != IMAGE_DOS_SIGNATURE)
{
printf("不含MZ标志，不是exe文件！\n");
return 0;
}
// 强制结构体类型转换
pDosHeader = (PIMAGE_DOS_HEADER)pImageBuffer;
if(*((PDWORD)((DWORD)pImageBuffer+pDosHeader->e_lfanew)) != IMAGE_NT_SIGNATURE)
{
printf("不是有效的PE标志！\n");
return 0;
}
// 强制结构体类型转换
pNTHeader = (PIMAGE_NT_HEADERS)((DWORD)pImageBuffer+pDosHeader->e_lfanew);
pPEHeader = (PIMAGE_FILE_HEADER)((DWORD)pNTHeader+4); // 这里必须强制类型转换
pOptionHeader = (PIMAGE_OPTIONAL_HEADER32)((DWORD)pPEHeader+IMAGE_SIZEOF_FILE_HEADER);
pSectionHeader = (PIMAGE_SECTION_HEADER)((DWORD)pOptionHeader+pPEHeader->SizeOfOptionalHeader);
pSectionHeader++;
// 判断代码区大小够不够
if(size_shellcode>(pSectionHeader->SizeOfRawData-pSectionHeader->Misc.VirtualSize))
{
printf("代码区空间不足！\n");
free(pImageBuffer);
return 0;
}
printf("pSectionHeader->PointerToRawData:%#x pSectionHeader->Misc.VirtualSize:%#x\n",pSectionHeader->PointerToRawData,pSectionHeader->Misc.VirtualSize);
printf("pImageBuffer:%#x\n",pImageBuffer);
// 将代码复制到空白区
PBYTE code_begin = (PBYTE)((DWORD)pImageBuffer+pSectionHeader->VirtualAddress+pSectionHeader->Misc.VirtualSize);
printf("pSectionHeader->VirtualAddress:%#X\n",pSectionHeader->VirtualAddress);
printf("code_begin:%#x\n",code_begin);
memcpy(code_begin,shellcode,size_shellcode);
// 修改E8 跳到messagebox
DWORD callAddr = (messagebox_add-(pOptionHeader->ImageBase+((DWORD)(code_begin+0xD)-(DWORD)pImageBuffer))); //(DWORD)code_begin+0xoD-(DWORD)pImageBuffer是E8下一条指令的地址的相对偏移
printf("callAddr:%#X\n",callAddr);
*(PDWORD)(code_begin+0x09) = callAddr; //填充数据
// 修改E9 跳回程序开始
DWORD jmpAddr = ((pOptionHeader->ImageBase + pOptionHeader->AddressOfEntryPoint)-(pOptionHeader->ImageBase+((DWORD)code_begin+size_shellcode-(DWORD)pImageBuffer)));
*(PDWORD)(code_begin+0x0E) = jmpAddr;
// 修改OEP
pOptionHeader->AddressOfEntryPoint = (DWORD)code_begin - (DWORD)pImageBuffer;
// imagebuffer->newfilebuffer
int size = CopyImageBufferToNewBuffer(pImageBuffer,pNewFileBuffer);
if(size = 0 || !pNewFileBuffer)
{
printf("imagebuffer->newfilebuffer失败！\n");
free(pImageBuffer);
free(pNewFileBuffer);
}
// 存盘
int ret4 = newbuffer_write2_exe(*pNewFileBuffer,FileSize, write_file_path);
if(!ret4)
{
printf("存盘失败！\n");
return 0;
}
return 1;
}
void operate_pe()
{
// 初始化操作
PVOID pFileBuffer = NULL;
PVOID pNewFileBuffer = NULL;
PVOID pImageBuffer = NULL;
DWORD NewFileBufferSize = 0;
// exe->filebuffer
int ret1 = ReadPEFile(file_path,&pFileBuffer); // &pFileBuffer(void**类型) 传递地址对其值可以进行修改
printf("exe->filebuffer 返回值为计算所得文件大小：%#x\n",ret1);
// filebuffer -> imagebuffer
int ret2 = CopyFileBufferToImageBuffer(pFileBuffer,&pImageBuffer);
printf("filebuffer -> imagebuffer返回值为计算所得文件大小：%#x\n",ret2);
// add_section
int ret3 = add_section(&pNewFileBuffer,pImageBuffer,ret1);
printf("%d",ret3);
free(pFileBuffer);
free(pNewFileBuffer);
free(pImageBuffer);
}
int main()
{
operate_pe();
return 0;
}
发表于 2020-7-2 17:25
