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How to implement PHP webshell to scan Trojan files

小云云

Jan 30, 2018 pm 02:28 PM

php web webshell

本文主要介绍PHP实现webshell扫描文件木马的方法,涉及php针对数值传输的过滤操作与文件识别等相关安全操作技巧,需要的朋友可以参考下，希望能帮助到大家。

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

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<!DOCTYPE html>
<html>
<head>
    <meta charset=&#39;gb2312&#39;>
    <title>PHP web shell scan</title>
</head>
<body>
</body>
<?php
define("SELF",php_self());
error_reporting(E_ERROR);
ini_set(&#39;max_execution_time&#39;,20000);
ini_set(&#39;memory_limit&#39;,&#39;512M&#39;);
header("content-Type: text/html; charset=gb2312");
function weevelyshell($file){
    $content=file_get_contents($file);
    if(
        (
        preg_match(&#39;#(\$\w{2,4}\s?=\s?str_replace\("\w+","","[\w_]+"\);\s?)+#s&#39;,$content)&&
      preg_match(&#39;#(\$\w{2,4}\s?=\s?"[\w\d\+\/\=]+";\s?)+#&#39;,$content)&&               preg_match(&#39;#\$[\w]{2,4}\s?=\s\$[\w]{2,4}\(\&#39;\&#39;,\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}\(\)\;#&#39;,$content))
          ||
          (preg_match(&#39;#\$\w+\d\s?=\s?str_replace\(\"[\w\d]+\",\"\",\"[\w\d]+\"\);#s&#39;,$content)&&
        preg_match(&#39;#\$\w+\s?=\s?\$[\w\d]+\(\&#39;\&#39;,\s?\$[\w\d]+\(\$\w+\(\$\w+\(\"[[:punct:]]+\",\s?\"\",\s?\$\w+\.\$\w+\.\$\w+\.\$\w+\)\)\)\);\s?\$\w+\(\);#s&#39;,$content))
        ){
        return true;
    }
}
function callbackshell($file){
    $content=file_get_contents($file);
    if(
        preg_match(&#39;#\$\w+\s?=\s?\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[.*?\]#is&#39;,$content)&&
        preg_match(&#39;#\$\w+\s?=\s?(?:new)?\s?array\w*\s?\(.*?_(?:GET|POST|REQUEST|COOKIE|SERVER)\[.*?\].*?\)+#is&#39;,$content)&&
        preg_match(&#39;#(?:array_(?:reduce|map|udiff|walk|walk_recursive|filter)|u[ak]sort)\s?\(.*?\)+?#is&#39;,$content)
        )
            return true;
}
function php_self(){
  $php_self=substr($_SERVER[&#39;PHP_SELF&#39;],strrpos($_SERVER[&#39;PHP_SELF&#39;],&#39;/&#39;)+1);
  return $php_self;
}
$matches = array(
        &#39;/mb_ereg_replace\([\&#39;\*\s\,\.\"]+\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[[\&#39;\"].*?[\&#39;\"][\]][\,\s\&#39;\"]+e[\&#39;\"]&#39;/is,
        &#39;/preg_filter\([\&#39;\"\|\.\*e]+.*\$_(?:GET|POST|REQUEST|COOKIE|SERVER)/is&#39;,
        &#39;/create_function\s?\(.*assert\(/is&#39;,
        &#39;/ini_get\(\&#39;safe_mode\&#39;\)/i&#39;,
        &#39;/get_current_user\(.*?\)/i&#39;,
        &#39;/@?assert\s?\(\$.*?\)/i&#39;,
        &#39;/proc_open\s?\(.*?pipe\&#39;,\s?\&#39;w\&#39;\)/is&#39;,
    &#39;/sTr_RepLaCe\s?\([\&#39;\"].*?[\&#39;\"],[\&#39;\"].*?[\&#39;\"]\s?,\s?\&#39;a[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?e[[:alnum:][:punct:]]+?r[[:alnum:][:punct:]]+?t[[:alnum:][:punct:]]+?\)/i&#39;,
        &#39;/preg_replace_callback\(.*?create_function\(/is&#39;,
        &#39;/filter_var(?:_array)?\s?.*?\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[[\&#39;\"][[:punct:][:alnum:]]+[\&#39;\"]\][[:punct:][:alnum:][:space:]]+?assert[\&#39;\"]\)/is&#39;,
        &#39;/ob_start\([\&#39;\"]+assert[\&#39;\"]+\)/is&#39;,
        &#39;/new\s?ReflectionFunction\(.*?->invoke\(/is&#39;,
      &#39;/PDO::FETCH_FUNC/&#39;,
        &#39;/\$\w+.*\s?(?:=|->)\s?.*?[\&#39;\"]assert[\&#39;\"]\)?/i&#39;,
        &#39;/\$\w+->(?:sqlite)?createFunction\(.*?\)/i&#39;,
        &#39;/eval\([\"\&#39;]?\\\?\$\w+\s?=\s?.*?\)/i&#39;,
        &#39;/eval\(.*?gzinflate\(base64_decode\(/i&#39;,
        &#39;/copy\(\$HTTP_POST_FILES\[\&#39;\w+\&#39;\]\s?\[\&#39;tmp_name\&#39;\]/i&#39;,
        &#39;/register_(?:shutdown|tick)_function\s?\(\$\w+,\s\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[.*?\]\)/is&#39;,
        &#39;/register_(?:shutdown|tick)_function\s?\(?[\&#39;\"]assert[\"\&#39;].*?\)/i&#39;,
        &#39;/call_user_func.*?\([\"|\&#39;]assert[\"|\&#39;],.*\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[[\&#39;|\"].*\]\)+/is&#39;,
      &#39;/preg_replace\(.*?e.*?\&#39;\s?,\s?.*?\w+\(.*?\)/i&#39;,
    &#39;/function_exists\s*\(\s*[\&#39;|\"](popen|exec|proc_open|system|passthru)+[\&#39;|\"]\s*\)/i&#39;,
    &#39;/(exec|shell_exec|system|passthru)+\s*\(\s*\$_(\w+)\[(.*)\]\s*\)/i&#39;,
    &#39;/(exec|shell_exec|system|passthru)+\s*\(\$\w+\)/i&#39;,
    &#39;/(exec|shell_exec|system|passthru)\s?\(\w+\(\"http_.*\"\)\)/i&#39;,
         &#39;/(?:john\.barker446@gmail\.com|xb5@hotmail\.com|shopen@aventgrup\.net|milw0rm\.com|www\.aventgrup\.net|mgeisler@mgeisler\.net)/i&#39;,
      &#39;/Php\s*?Shell/i&#39;,
    &#39;/((udp|tcp)\:\/\/(.*)\;)+/i&#39;,
    &#39;/preg_replace\s*\((.*)\/e(.*)\,\s*\$_(.*)\,(.*)\)/i&#39;,
    &#39;/preg_replace\s*\((.*)\(base64_decode\(\$/i&#39;,
    &#39;/(eval|assert|include|require|include_once|require_once)+\s*\(\s*(base64_decode|str_rot13|gz(\w+)|file_(\w+)_contents|(.*)php\:\/\/input)+/i&#39;,
    &#39;/(eval|assert|include|require|include_once|require_once|array_map|array_walk)+\s*\(.*?\$_(?:GET|POST|REQUEST|COOKIE|SERVER|SESSION)+\[(.*)\]\s*\)/i&#39;,
    &#39;/eval\s*\(\s*\(\s*\$\$(\w+)/i&#39;,
      &#39;/((?:include|require|include_once|require_once)+\s*\(?\s*[\&#39;|\"]\w+\.(?!php).*[\&#39;|\"])/i&#39;,
    &#39;/\$_(\w+)(.*)(eval|assert|include|require|include_once|require_once)+\s*\(\s*\$(\w+)\s*\)/i&#39;,
    &#39;/\(\s*\$_FILES\[(.*)\]\[(.*)\]\s*\,\s*\$_(GET|POST|REQUEST|FILES)+\[(.*)\]\[(.*)\]\s*\)/i&#39;,
    &#39;/(fopen|fwrite|fputs|file_put_contents)+\s*\((.*)\$_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\](.*)\)/i&#39;,
    &#39;/echo\s*curl_exec\s*\(\s*\$(\w+)\s*\)/i&#39;,
    &#39;/new com\s*\(\s*[\&#39;|\"]shell(.*)[\&#39;|\"]\s*\)/i&#39;,
    &#39;/\$(.*)\s*\((.*)\/e(.*)\,\s*\$_(.*)\,(.*)\)/i&#39;,
    &#39;/\$_\=(.*)\$_/i&#39;,
    &#39;/\$_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\(\s*\$(.*)\)/i&#39;,
    &#39;/\$(\w+)\s*\(\s*\$_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\s*\)/i&#39;,
    &#39;/\$(\w+)\s*\(\s*\$\{(.*)\}/i&#39;,
    &#39;/\$(\w+)\s*\(\s*chr\(\d+\)/i&#39;
);
function antivirus($dir,$exs,$matches) {
    if(($handle = @opendir($dir)) == NULL) return false;
    while(false !== ($name = readdir($handle))) {
        if($name == &#39;.&#39; || $name == &#39;..&#39;) 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($path.&#39;/&#39;,$exs,$matches);
        } elseif(strpos($name,&#39;;&#39;) > -1 || strpos($name,&#39;%00&#39;) > -1 || strpos($name,&#39;/&#39;) > -1) {
            echo &#39;特征 <input type="text" style="width:250px;" value="解析漏洞">     &#39;.$path.&#39;<p></p>&#39;; flush(); ob_flush();
        }
        else {
            if(!preg_match($exs,$name)) continue;
            if(filesize($path) > 10000000) continue;
            $fp = fopen($path,&#39;r&#39;);
            $code = fread($fp,filesize($path));
            fclose($fp);
            if(empty($code)) continue;
            if(weevelyshell($path)){
            echo &#39;特征 <input type="text" style="width:250px;" value="weevely 加密shell">     &#39;.$path.&#39;<p></p>&#39;; flush(); ob_flush();
        }elseif(callbackshell($path)){
                echo &#39;特征 <input type="text" style="width:250px;" value="Callback shell">     &#39;.$path.&#39;<p></p>&#39;; flush(); ob_flush();
        }
            foreach($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 && $len < 200) {
                    echo &#39;特征 <input type="text" style="width:250px;" value="&#39;.htmlspecialchars($array[0]).&#39;">    &#39;.$path.&#39;<p></p>&#39;;
                    flush(); ob_flush(); break;
                }
            }
            unset($code,$array);
        }
    }
    closedir($handle);
    return true;
}
function strdir($str) { return str_replace(array(&#39;\\&#39;,&#39;//&#39;,&#39;//&#39;),array(&#39;/&#39;,&#39;/&#39;,&#39;/&#39;),chop($str)); }
echo &#39;<form method="POST">&#39;;
echo &#39;路径: <input type="text" name="dir" value="&#39;.($_POST[&#39;dir&#39;] ? strdir($_POST[&#39;dir&#39;].&#39;/&#39;) : strdir($_SERVER[&#39;DOCUMENT_ROOT&#39;].&#39;/&#39;)).&#39;" style="width:398px;"><p></p>&#39;;
echo &#39;后缀: <input type="text" name="exs" value="&#39;.($_POST[&#39;exs&#39;] ? $_POST[&#39;exs&#39;] : &#39;.php|.inc|.phtml&#39;).&#39;" style="width:398px;"><p></p>&#39;;
echo &#39;操作: <input type="submit" style="width:80px;" value="scan"><p></p>&#39;;
echo &#39;</form>&#39;;
if(file_exists($_POST[&#39;dir&#39;]) && $_POST[&#39;exs&#39;]) {
    $dir = strdir($_POST[&#39;dir&#39;].&#39;/&#39;);
    $exs = &#39;/(&#39;.str_replace(&#39;.&#39;,&#39;\\.&#39;,$_POST[&#39;exs&#39;]).&#39;)/i&#39;;
    echo antivirus($dir,$exs,$matches) ? &#39;</br ><p></p>扫描完毕!&#39; : &#39;</br > <p></p>扫描中断&#39;;
}
?>
</html>

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How to implement PHP webshell to scan Trojan files

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