本文实例讲述了PHP实现webshell扫描文件木马的方法。分享给大家供大家参考，具体如下：
可扫描 weevelyshell 生成 或加密的shell 及各种变异webshell
目前仅支持php
支持扫描 weevelyshell 生成 或加密的shell
支持扫描callback一句话shell
支持各种php大马
<!DOCTYPE html>
<html>
<head>
<meta charset='gb2312'>
<title>PHP web shell scan</title>
</head>
<body>
</body>
<?php
define("SELF",php_self());
error_reporting(E_ERROR);
ini_set('max_execution_time',20000);
ini_set('memory_limit','512M');
header("content-Type: text/html; charset=gb2312");
function weevelyshell($file){
$content=file_get_contents($file);
if(
(
preg_match('#($w{2,4}s?=s?str_replace("w+","","[w_]+");s?)+#s',$content)&&
preg_match('#($w{2,4}s?=s?"[wd+/=]+";s?)+#',$content)&& preg_match('#$[w]{2,4}s?=s$[w]{2,4}('',s?$w{2,4}($w{2,4}("w{1,4}",s?"",s?$w{2,4}.$w{2,4}.$w{2,4}.$w{2,4})));s+?$w{2,4}();#',$content))
||
(preg_match('#$w+ds?=s?str_replace("[wd]+","","[wd]+");#s',$content)&&
preg_match('#$w+s?=s?$[wd]+('',s?$[wd]+($w+($w+("[[:punct:]]+",s?"",s?$w+.$w+.$w+.$w+))));s?$w+();#s',$content))
){
return true;
}
}
function callbackshell($file){
$content=file_get_contents($file);
if(
preg_match('#$w+s?=s?$_(?:GET|POST|REQUEST|COOKIE|SERVER)[.*?]#is',$content)&&
preg_match('#$w+s?=s?(?:new)?s?arrayw*s?(.*?_(?:GET|POST|REQUEST|COOKIE|SERVER)[.*?].*?)+#is',$content)&&
preg_match('#(?:array_(?:reduce|map|udiff|walk|walk_recursive|filter)|u[ak]sort)s?(.*?)+?#is',$content)
)
return true;
}
function php_self(){
$php_self=substr($_SERVER['PHP_SELF'],strrpos($_SERVER['PHP_SELF'],'/')+1);
return $php_self;
}
$matches = array(
'/mb_ereg_replace(['*s,."]+$_(?:GET|POST|REQUEST|COOKIE|SERVER)[['"].*?['"][]][,s'"]+e['"]'/is,
'/preg_filter(['"|.*e]+.*$_(?:GET|POST|REQUEST|COOKIE|SERVER)/is',
'/create_functions?(.*assert(/is',
'/ini_get('safe_mode')/i',
'/get_current_user(.*?)/i',
'/@?asserts?($.*?)/i',
'/proc_opens?(.*?pipe',s?'w')/is',
'/sTr_RepLaCes?(['"].*?['"],['"].*?['"]s?,s?'a[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?e[[:alnum:][:punct:]]+?r[[:alnum:][:punct:]]+?t[[:alnum:][:punct:]]+?)/i',
'/preg_replace_callback(.*?create_function(/is',
'/filter_var(?:_array)?s?.*?$_(?:GET|POST|REQUEST|COOKIE|SERVER)[['"][[:punct:][:alnum:]]+['"]][[:punct:][:alnum:][:space:]]+?assert['"])/is',
'/ob_start(['"]+assert['"]+)/is',
'/news?ReflectionFunction(.*?->invoke(/is',
'/PDO::FETCH_FUNC/',
'/$w+.*s?(?:=|->)s?.*?['"]assert['"])?/i',
'/$w+->(?:sqlite)?createFunction(.*?)/i',
'/eval(["']?\?$w+s?=s?.*?)/i',
'/eval(.*?gzinflate(base64_decode(/i',
'/copy($HTTP_POST_FILES['w+']s?['tmp_name']/i',
'/register_(?:shutdown|tick)_functions?($w+,s$_(?:GET|POST|REQUEST|COOKIE|SERVER)[.*?])/is',
'/register_(?:shutdown|tick)_functions?(?['"]assert["'].*?)/i',
'/call_user_func.*?(["|']assert["|'],.*$_(?:GET|POST|REQUEST|COOKIE|SERVER)[['|"].*])+/is',
'/preg_replace(.*?e.*?'s?,s?.*?w+(.*?)/i',
'/function_existss*(s*['|"](popen|exec|proc_open|system|passthru)+['|"]s*)/i',
'/(exec|shell_exec|system|passthru)+s*(s*$_(w+)[(.*)]s*)/i',
'/(exec|shell_exec|system|passthru)+s*($w+)/i',
'/(exec|shell_exec|system|passthru)s?(w+("http_.*"))/i',
'/(?:john.barker446@gmail.com|xb5@hotmail.com|shopen@aventgrup.net|milw0rm.com|www.aventgrup.net|mgeisler@mgeisler.net)/i',
'/Phps*?Shell/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*(.*?$_(?:GET|POST|REQUEST|COOKIE|SERVER|SESSION)+[(.*)]s*)/i',
'/evals*(s*(s*$$(w+)/i',
'/((?:include|require|include_once|require_once)+s*(?s*['|"]w+.(?!php).*['|"])/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',
'/$(w+)s*(s*${(.*)}/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(strstr($name,SELF)) continue;
//$path=iconv("UTF-8","gb2312",$path);
if(is_dir($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:250px;" 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($code)) continue;
if(weevelyshell($path)){
echo '特征 <input type="text" style="width:250px;" value="weevely 加密shell"> '.$path.'<div></div>'; flush(); ob_flush();
}elseif(callbackshell($path)){
echo '特征 <input type="text" style="width:250px;" value="Callback shell"> '.$path.'<div></div>'; flush(); ob_flush();
}
foreach($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 > 6 && $len < 200) {
echo '特征 <input type="text" style="width:250px;" value="'.htmlspecialchars($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) ? '</br ><div></div>扫描完毕!' : '</br > <div></div>扫描中断';
}
?>
</html>
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