这些题开始做的时候感觉挺难的，特别是 misc 部分的根本没有思路，后面千幸万苦搞出来的，其实解题简单主要是思路。
0x01 misc1
下载一个 txt 文件，打开后乱码，用 hex 打开后，编码 ASCII 切换为 EBCDIC，尾部得到 flag
0x02 misc2
访问 /r 然后 Post 提交 data=/dev/fd/3 ，可得 flag
0x03 misc3
下载 html 文件后查看控制台，得到关键信息
发现只有两种字符串 ‌ 和 ​ 所以用 01 替换后转文本得 flag
0x04 webshell
下载流量包发现是蚁剑流量，分析得知使用了 aes 加密，在 chr 混淆中还原 php 代码得到 aes key
a = 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for i in range(0,len(a)):
print(chr(a[i]),end="")
解码得
使用 key 解码
0x05 towcats
下载文件解压后发现两张相似图片但是大小不一致，猜测为盲水印。
打开图片发现 flag。
0x06 ezbypass
构造以下代码查看 phpinfo 可得被禁函数
使用蚁剑构造代码连接
使用插件
得到 flag
0x08 ezjava
该题目就是 Fastjson <= 1.2.47 远程命令执行漏洞 。 下载 poc: https://github.com/CaijiOrz/fastjson-1.2.47-RCE 参考： https://yaofeifly.github.io/2019/07/28/fastjson/
0x17 re1
逆向可得是 RC4 算法 根据某大佬博客写出以下解密脚本
即可获得 flag
结语
成功进入西南赛区前 5，西安见。