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记录一次screw加密的PHP代码项目解密过程

  • 2026-02-03 13:40:47
记录一次screw加密的PHP代码项目解密过程
某次项目，在审计源代码的时候，发现代码被加密混淆
完全没法看，而后在设备里找到了php_screw.so文件，这个文件里存放了key和头长度，这两个是用来后去解密的，key可以直接使用ida打开so文件直接查看
通过查看hex获得十六进制的密钥，但是这里很奇怪，脚本里写的是从开头到第一个空字节结束，但是我遇到的这个需要加上00才行
github项目地址

https://github.com/DaBoQuan/php_unscrew

也可以使用命令行查看key

objdump -s -j .data php_screw.so

获取头长度

objdump -s -j .rodata php_screw.so

这个长度PM9SCREW为8，需要加上前后的两个换行符号，就是10

解密效果，可以看到，不加00加密失败，加了00解密成功

也是成功解密，并且成功看到了漏洞代码

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  2. 运行时间 : 0.196461s [ 吞吐率：5.09req/s ] 内存消耗：4,510.20kb 文件加载：140
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  1. CONNECT:[ UseTime:0.000950s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000794s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003825s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001648s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000736s ]
  6. SELECT * FROM `set` [ RunTime:0.006737s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000779s ]
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  9. UPDATE `article` SET `lasttime` = 1770432328 WHERE `id` = 470053 [ RunTime:0.007875s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000318s ]
  11. SELECT * FROM `article` WHERE `id` < 470053 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009689s ]
  12. SELECT * FROM `article` WHERE `id` > 470053 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010542s ]
  13. SELECT * FROM `article` WHERE `id` < 470053 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015693s ]
  14. SELECT * FROM `article` WHERE `id` < 470053 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014389s ]
  15. SELECT * FROM `article` WHERE `id` < 470053 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004300s ]
0.198014s