Yuku's Blog

<?php

/**********************

网上公布的各种PHP后门全军覆没

针对一些特殊变形的后门需要自己添加特征

误报率不到百分之一

**********************/error_reporting(E_ERROR);ini_set('max_execution_time',20000);ini_set('memory_limit','512M');header("content-Type: text/html; charset=gb2312");$matches = array(

    '/function\_exists\s*\(\s*[\'|\"](popen|exec|proc\_open|system|passthru)+[\'|\"]\s*\)/i',

    '/(exec|shell\_exec|system|passthru)+\s*\(\s*\$\_(\w+)\[(.*)\]\s*\)/i',

    '/((udp|tcp)\:\/\/(.*)\;)+/i',

    '/preg\_replace\s*\((.*)\/e(.*)\,\s*\$\_(.*)\,(.*)\)/i',

    '/preg\_replace\s*\((.*)\(base64\_decode\(\$/i',

    '/(eval|assert|include|require|include\_once|require\_once)+\s*\(\s*(base64\_decode|str\_rot13|gz(\w+)|file\_(\w+)\_contents|(.*)php\:\/\/input)+/i',

    '/(eval|assert|include|require|include\_once|require\_once|array\_map|array\_walk)+\s*\(\s*\$\_(GET|POST|REQUEST|COOKIE|SERVER|SESSION)+\[(.*)\]\s*\)/i',

    '/eval\s*\(\s*\(\s*\$\$(\w+)/i',

    '/(include|require|include\_once|require\_once)+\s*\(\s*[\'|\"](\w+)\.(jpg|gif|ico|bmp|png|txt|zip|rar|htm|css|js)+[\'|\"]\s*\)/i',

    '/\$\_(\w+)(.*)(eval|assert|include|require|include\_once|require\_once)+\s*\(\s*\$(\w+)\s*\)/i',

    '/\(\s*\$\_FILES\[(.*)\]\[(.*)\]\s*\,\s*\$\_(GET|POST|REQUEST|FILES)+\[(.*)\]\[(.*)\]\s*\)/i',

    '/(fopen|fwrite|fputs|file\_put\_contents)+\s*\((.*)\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\](.*)\)/i',

    '/echo\s*curl\_exec\s*\(\s*\$(\w+)\s*\)/i',

    '/new com\s*\(\s*[\'|\"]shell(.*)[\'|\"]\s*\)/i',

    '/\$(.*)\s*\((.*)\/e(.*)\,\s*\$\_(.*)\,(.*)\)/i',

    '/\$\_\=(.*)\$\_/i',

    '/\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\(\s*\$(.*)\)/i',

    '/\$(\w+)\s*\(\s*\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\s*\)/i',

    '/\$(\w+)\s*\(\s*\$\{(.*)\}/i',

    '/\$(\w+)\s*\(\s*chr\(\d+\)/i');function antivirus($dir,$exs,$matches) {

    if(($handle = @opendir($dir)) == NULL) return false;

    while(false !== ($name = readdir($handle))) {

        if($name == '.' || $name == '..') continue;

        $path = $dir.$name;

        if(is_dir($path)) {

            //chmod($path,0777);/*主要针对一些0111的目录*/

            if(is_readable($path)) antivirus($path.'/',$exs,$matches);

        } elseif(strpos($name,';') > -1 || strpos($name,'%00') > -1 || strpos($name,'/') > -1) {

            echo '特征 <input type="text" style="width:218px;" value="解析漏洞"> '.$path.'<div></div>'; flush(); ob_flush();

        } else {

            if(!preg_match($exs,$name)) continue;

            if(filesize($path) > 10000000) continue;

            $fp = fopen($path,'r');

            $code = fread($fp,filesize($path));

            fclose($fp);

            if(empty($code)) continue;

            foreach($matches as $matche) {

                $array = array();

                preg_match($matche,$code,$array);

                if(!$array) continue;

                if(strpos($array[0],"\x24\x74\x68\x69\x73\x2d\x3e")) continue;

                $len = strlen($array[0]);

                if($len > 6 && $len < 200) {

                    echo '特征 <input type="text" style="width:218px;" value="'.htmlspecialchars($array[0]).'"> '.$path.'<div></div>';

                    flush(); ob_flush(); break;

                }

            }

            unset($code,$array);

        }

    }

    closedir($handle);

    return true;}function strdir($str) { return str_replace(array('\\','//','//'),array('/','/','/'),chop($str)); }echo '<form method="POST">';echo '路径: <input type="text" name="dir" value="'.($_POST['dir'] ? strdir($_POST['dir'].'/') : strdir($_SERVER['DOCUMENT_ROOT'].'/')).'" style="width:398px;"><div></div>';echo '后缀: <input type="text" name="exs" value="'.($_POST['exs'] ? $_POST['exs'] : '.php|.inc|.phtml').'" style="width:398px;"><div></div>';echo '操作: <input type="submit" style="width:80px;" value="scan"><div></div>';echo '</form>';if(file_exists($_POST['dir']) && $_POST['exs']) {

    $dir = strdir($_POST['dir'].'/');

    $exs = '/('.str_replace('.','\\.',$_POST['exs']).')/i';

    echo antivirus($dir,$exs,$matches) ? '<div></div>扫描完毕' : '<div></div>扫描中断';}?>