PHP webshell扫描木马文件的实现方法

小云云
发布时间：2018-01-30 14:28:58
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来源于php中文网
原创
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



    
    PHP web shell scan



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)_function\s?\(\$\w+,\s\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[.*?\]\)/is',
        '/register_(?:shutdown|tick)_function\s?\(?[\'\"]assert[\"\'].*?\)/i',
        '/call_user_func.*?\([\"|\']assert[\"|\'],.*\$_(?:GET|POST|REQUEST|COOKIE|SERVER)\[[\'|\"].*\]\)+/is',
      '/preg_replace\(.*?e.*?\'\s?,\s?.*?\w+\(.*?\)/i',
    '/function_exists\s*\(\s*[\'|\"](popen|exec|proc_open|system|passthru)+[\'|\"]\s*\)/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',
      '/Php\s*?Shell/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*\(.*?\$_(?:GET|POST|REQUEST|COOKIE|SERVER|SESSION)+\[(.*)\]\s*\)/i',
    '/eval\s*\(\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',
    '/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(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      '.$path.'
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						'; flush(); ob_flush();
        }
        else {
            if(!preg_match($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      '.$path.'
立即学习“PHP免费学习笔记（深入）”；'; flush(); ob_flush();
        }elseif(callbackshell($path)){
                echo '特征      '.$path.'
立即学习“PHP免费学习笔记（深入）”；'; flush(); ob_flush();
        }
            foreach($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 && $len < 200) {
                    echo '特征     '.$path.'
立即学习“PHP免费学习笔记（深入）”；';
                    flush(); ob_flush(); break;
                }
            }
            unset($code,$array);
        }
    }
    closedir($handle);
    return true;
}
function strdir($str) { return str_replace(array('\\','//','//'),array('/','/','/'),chop($str)); }
echo '';
echo '路径: 
立即学习“PHP免费学习笔记（深入）”；';
echo '后缀: 
立即学习“PHP免费学习笔记（深入）”；';
echo '操作: 
立即学习“PHP免费学习笔记（深入）”；';
echo '';
if(file_exists($_POST['dir']) && $_POST['exs']) {
    $dir = strdir($_POST['dir'].'/');
    $exs = '/('.str_replace('.','\\.',$_POST['exs']).')/i';
    echo antivirus($dir,$exs,$matches) ? '
立即学习“PHP免费学习笔记（深入）”；
扫描完毕!' : '
 
立即学习“PHP免费学习笔记（深入）”；扫描中断';
}
?>