re學習筆記（14）CG-CTF-re-WxyVM

新手一枚，如有錯誤（不足）請指正，謝謝！！
題目網址：https://cgctf.nuptsast.com/challenges#Re

下載下文件，IDA載入，找到main函數，F5僞代碼

雙擊進入，查看correct的存放了啥，經整理

對輸入的字符串進行處理
接下來就是寫腳本了，先將那15000的數據導出來，


然後shift+e導成一個txt文本文檔

#include <stdio.h>
int main()
{
    char str[15000] ={}//這裏的數據直接用txt文本文檔裏的粘貼，15000行太長了
char strings[] = {0xC4,0X34,0x22,0xB1,0xD3,0x11,0x97,0x7,0xDB,0x37,0xC4,0x6,0x1D,0xFC,0x5B,0xED,0x98,0xDF,0x94,0xD8,0xB3,0x84,0xCC,0x8,0};

int v0,i,result;
char v3;
  for ( i = 14997; i >= 0; i -= 3 )
  {
    v0 = str[i];
    v3 = str[i + 2];
    result = v0;
    switch ( v0 )
    {
      case 1u:
        result = str[i + 1];
        strings[(int)result] -= v3;
        break;
      case 2u:
        result = str[i + 1];
        strings[(int)result] += v3;
        break;
      case 3u:
        result = str[i + 1];
        strings[(int)result] ^= v3;
        break;
      case 4u:
        result = str[i + 1];
        strings[(int)result] /= v3;
        break;
      case 5u:
        result = str[i + 1];
        strings[(int)result] ^= strings[str[i + 2]];
        break;
      default:
        continue;
    }
    }
puts(strings);
    return 0;
}

運行腳本得到flag爲nctf{Embr4ce_Vm_j0in_R3}