webshell后门扫描-PHP版

<?php
/**********************
  php扫描后门
**********************/
error_reporting(E_ERROR);
ini_set(’max_execution_time’,20000);
ini_set(’memory_limit’,’512M’);
header("content-Type: text/html; charset=gb2312");
$matches = array(
        ’/function\_existss*(s*[’|"](popen|exec|proc\_open|system|passthru)+[’|"]s*)/i’,
        ’/(exec|shell\_exec|system|passthru)+s*(s*$\_(w+)[(.*)]s*)/i’,
        ’/((udp|tcp)://(.*);)+/i’,
        ’/preg\_replaces*((.*)/e(.*),s*$\_(.*),(.*))/i’,
        ’/preg\_replaces*((.*)(base64\_decode($/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’,
        ’/evals*(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*((.*)$\_(GET|POST|REQUEST|COOKIE|SERVER)+[(.*)](.*))/i’,
        ’/echos*curl\_execs*(s*$(w+)s*)/i’,
        ’/new coms*(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’,
        ’/$(w+)(${(.*)}/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($path)) {
                        if(is_readable($path)) antivirus($path.’/’,$exs,$matches);
                } elseif(strpos($name,’;’) > -1 || strpos($name,’%00’) > -1 || strpos($name,’/’) > -1) {
                        echo ’<p>特征 <input type="text"  value="解析漏洞"> ’.$path.’</p>’; flush(); ob_flush();
                } else {
                        if(!preg_match($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],"x24x74x68x69x73x2dx3e")) continue;
                                $len = strlen($array[0]);
                                if($len > 10 && $len < 1500) {
                                        echo ’<p>特征 <input type="text"  value="’.htmlspecialchars($array[0]).’"> ’.$path.’</p>’;
                                        flush(); ob_flush(); break;
                                }
                        }
                        unset($code,$array);
                }
        }
        closedir($handle);
        return true;
}
function strdir($str) { return str_replace(array(’’,’//’,’//’),array(’/’,’/’,’/’),chop($str)); }
echo ’<form method="POST">’;
echo ’<p>路径: <input type="text" name="dir" value="’.($_POST[’dir’] ? strdir($_POST[’dir’].’/’) : strdir($_SERVER[’DOCUMENT_ROOT’].’/’)).’" ></p>’;
echo ’<p>后缀: <input type="text" name="exs" value="’.($_POST[’exs’] ? $_POST[’exs’] : ’.php|.inc|.phtml’).’" ></p>’;
echo ’<p>操作: <input type="submit"  value="scan"></p>’;
echo ’</form>’;
if(file_exists($_POST[’dir’]) && $_POST[’exs’]) {
        $dir = strdir($_POST[’dir’].’/’);
        $exs = ’/(’.str_replace(’.’,’.’,$_POST[’exs’]).’)/i’;
        echo antivirus($dir,$exs,$matches) ? ’<p>扫描完毕</p>’ : ’<p>扫描中断</p>’;
}
?>