C++实现小巧玲珑并且无毒的文件补丁

180it 2020-10-16 PM 51℃ 0条

从网上找到了一段使用C++完成的文件补丁代码,觉得挺好的,其他补丁制作工具制作出来的补丁均可以扫描出病毒,但是C++原生实现的,基本无毒,并且小巧,觉得非常不错,分享给大家,希望大家有好的思路共同讨论下。

代码如下:

#include <Windows.h>
#include <iostream>
#include <stdio.h>
 
using namespace std;
 
int main(int argc, char *argv[])
{
    DWORD dwFileOffset = 0x449;  //文件偏移地址
 
    BYTE bCode = 0;
    DWORD dwReadNum = 0;
 
    if (argc!=2)
    {
     cout << "FilePatch V1.0\n" << endl;
     cout << "Usage:FilePatch.exe filename" << endl;
     return -1;
    }
    //打开文件
    HANDLE hFile = CreateFile(argv[1], GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
 
    if (INVALID_HANDLE_VALUE == hFile)
    {
        cout << "File not exsit or it's already opened!" << endl;
        return -1;
    }
    SetFilePointer(hFile, dwFileOffset, 0, FILE_BEGIN);
    bCode=ReadFile(hFile, (LPVOID)&bCode, sizeof(BYTE), &dwReadNum, NULL);
 
    //比较当前位置是否为JNZ
    if (TEXT('\x75') != bCode)
    {
        cout << "The bCode is:" << bCode << endl;
        cout << "\nPlease close file and try again." << endl;
 
        CloseHandle(hFile);
 
    }
    //修改为JZ
    else
    {
        bCode = TEXT('\x74');
        SetFilePointer(hFile, dwFileOffset, 0, FILE_BEGIN);
        WriteFile(hFile, (LPVOID)&bCode, sizeof(BYTE), &dwReadNum, NULL);
        cout << "Write the hex code Successfully !" << endl;
        CloseHandle(hFile);
    }
    //运行修改后的程序
    WinExec(argv[1], SW_SHOW);
    getchar();
    return 0;
}
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C++实现小巧玲珑并且无毒的文件补丁