本文章來給大家介紹一個php webshell掃描後門木馬實例程序，這個可以掃描你網站上的木馬程序哦，這個給大家找網站木馬提供了很大的方便，有需要的朋友可參考。
代碼如下
復制代碼
<?php
/**********************
php掃描後門
**********************/
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+)＼(＼$＼{(.*)＼}/i'
);
function antivirus($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" style="width:218px;" 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],"＼x24＼x74＼x68＼x69＼x73＼x2d＼x3e")) continue;
$len = strlen($array[0]);
if($len > 10 && $len < 1500) {
echo '<p>特征 <input type="text" style="width:218px;" value="'.htmlspecialchars($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>路徑: <input type="text" name="dir" value="'.($_POST['dir'] ? strdir($_POST['dir'].'/') : strdir($_SERVER['DOCUMENT_ROOT'].'/')).'" style="width:398px;"></p>';
echo '<p>後綴: <input type="text" name="exs" value="'.($_POST['exs'] ? $_POST['exs'] : '.php|.inc|.phtml').'" style="width:398px;"></p>';
echo '<p>操作: <input type="submit" style="width:80px;" value="scan"></p>';
echo '</form>';
if(file_exists($_POST['dir']) && $_POST['exs']) {
$dir = strdir($_POST['dir'].'/');
$exs = '/('.str_replace('.','＼＼.',$_POST['exs']).')/i';
echo antivirus($dir,$exs,$matches) ? '<p>掃描完畢</p>' : '<p>掃描中斷</p>';
}
?>
