PHP实现webshell扫描文件木马的方法

2024-05-04 23:59:05

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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><?phpdefine("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('#(/$/w{2,4}/s?=/s?"[/w/d/+///=]+";/s?)+#',$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('#/$/w+/d/s?=/s?str_replace/(/"[/w/d]+/",/"/",/"[/w/d]+/"/);#s',$content)&&        preg_match('#/$/w+/s?=/s?/$[/w/d]+/(/'/',/s?/$[/w/d]+/(/$/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?array/w*/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_function/s?/(.*assert/(/is',        '/ini_get/(/'safe_mode/'/)/i',        '/get_current_user/(.*?/)/i',        '/@?assert/s?/(/$.*?/)/i',        '/proc_open/s?/(.*?pipe/',/s?/'w/'/)/is',    '/sTr_RepLaCe/s?/([/'/"].*?[/'/"],[/'/"].*?[/'/"]/s?,/s?/'a[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?s[[:alnum:][:punct:]]+?e[[:alnum:][:punct:]]+?r[[:alnum:][:punct:]]+?t[[:alnum:][:punct:]]+?/)/i',        '/preg_replace_callback/(.*?create_function/(/is',        '/filter_var(?:_array)?/s?.*?/$_(?:GET|POST|REQUEST|COOKIE|SERVER)/[[/'/"][[:punct:][:alnum:]]+[/'/"]/][[:punct:][:alnum:][:space:]]+?assert[/'/"]/)/is',        '/ob_start/([/'/"]+assert[/'/"]+/)/is',        '/new/s?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)_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 <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],"/x24/x74/x68/x69/x73/x2d/x3e")) continue;                $len = strlen($array[0]);                if($len > 6 && $len < 200) {                    echo '特征 <input type="text" style="width:250px;" value="'.htmlspecialchars($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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