在awd线下赛的时候，可以用这个脚本来检测有没有一句话木马
脚本如下：
<!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',$content)&&preg_match('#(\$\w{2,4}\s?=\s?"[\w\d\+\/\=]+";\s?)+#',$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>
创建一个php文件，把代码拷进去，访问即可使用：
测试了一下
像这种变形的检测不出来，其他的基本都检测得出来
<?php @$_++;$__=("`"^"?").(":"^"}").("%"^"`").("{"^"/");$___=("$"^"{").("~"^".").("/"^"`").("-"^"~").("("^"|");${$__}[!$_](${$___}[$_]); ?>
不过可以自己往里面添加正则表达式逐步完善
