本文實例講述了PHP實現webshell掃描文件木馬的方法。分享給大家供大家參考，具體如下：
可掃描 weevelyshell 生成 或加密的shell 及各種變異webshell
目前僅支持php
支持掃描 weevelyshell 生成 或加密的shell
支持掃描callback一句話shell
支持各種php大馬
<!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($path,0777);/*主要針對一些0111的目錄*/ if(is_readable($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 '路徑: <input type="text" name="dir" value="'.($_POST['dir'] ? strdir($_POST['dir'].'/') : strdir($_SERVER['DOCUMENT_ROOT'].'/')).'" style="width:398px;"><div></div>';echo '后綴: <input type="text" name="exs" value="'.($_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>掃描完畢!' : '</br > <div></div>掃描中斷';}?></html>希望本文所述對大家PHP程序設計有所幫助。
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