完美扫描PHP特殊一句话后门脚本

发表于 2013年11月01日
周边

作者 Spider
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

代码如下保存为*.php

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';
}

error_reporting(E_ERROR);

ini_set('max_execution_time',20000);

ini_set('memory_limit','512M');

header("content-Type: text/html; charset=gb2312");

$matches = array(

'/(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\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',

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