linux、渗透测试、网络安全、CTF、windows

完美扫描PHP特殊一句话后门

Seventeen.:

<?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';}?>



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