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https://github.com/tennc/webshell
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84 lines
4.1 KiB
PHP
84 lines
4.1 KiB
PHP
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<?php
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/**********************
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作者 Spider
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网上公布的各种PHP后门全军覆没
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针对一些特殊变形的后门需要自己添加特征
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误报率不到百分之一
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**********************/
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error_reporting(E_ERROR);
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ini_set('max_execution_time',20000);
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ini_set('memory_limit','512M');
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header("content-Type: text/html; charset=gb2312");
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$matches = array(
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'/function\_exists\s*\(\s*[\'|\"](popen|exec|proc\_open|system|passthru)+[\'|\"]\s*\)/i',
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'/(exec|shell\_exec|system|passthru)+\s*\(\s*\$\_(\w+)\[(.*)\]\s*\)/i',
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'/((udp|tcp)\:\/\/(.*)\;)+/i',
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'/preg\_replace\s*\((.*)\/e(.*)\,\s*\$\_(.*)\,(.*)\)/i',
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'/preg\_replace\s*\((.*)\(base64\_decode\(\$/i',
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'/(eval|assert|include|require|include\_once|require\_once)+\s*\(\s*(base64\_decode|str\_rot13|gz(\w+)|file\_(\w+)\_contents|(.*)php\:\/\/input)+/i',
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'/(eval|assert|include|require|include\_once|require\_once|array\_map|array\_walk)+\s*\(\s*\$\_(GET|POST|REQUEST|COOKIE|SERVER|SESSION)+\[(.*)\]\s*\)/i',
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'/eval\s*\(\s*\(\s*\$\$(\w+)/i',
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'/(include|require|include\_once|require\_once)+\s*\(\s*[\'|\"](\w+)\.(jpg|gif|ico|bmp|png|txt|zip|rar|htm|css|js)+[\'|\"]\s*\)/i',
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'/\$\_(\w+)(.*)(eval|assert|include|require|include\_once|require\_once)+\s*\(\s*\$(\w+)\s*\)/i',
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'/\(\s*\$\_FILES\[(.*)\]\[(.*)\]\s*\,\s*\$\_(GET|POST|REQUEST|FILES)+\[(.*)\]\[(.*)\]\s*\)/i',
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'/(fopen|fwrite|fputs|file\_put\_contents)+\s*\((.*)\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\](.*)\)/i',
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'/echo\s*curl\_exec\s*\(\s*\$(\w+)\s*\)/i',
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'/new com\s*\(\s*[\'|\"]shell(.*)[\'|\"]\s*\)/i',
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'/\$(.*)\s*\((.*)\/e(.*)\,\s*\$\_(.*)\,(.*)\)/i',
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'/\$\_\=(.*)\$\_/i',
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'/\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\(\s*\$(.*)\)/i',
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'/\$(\w+)\s*\(\s*\$\_(GET|POST|REQUEST|COOKIE|SERVER)+\[(.*)\]\s*\)/i',
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'/\$(\w+)\s*\(\s*\$\{(.*)\}/i',
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'/\$(\w+)\s*\(\s*chr\(\d+\)/i'
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);
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function antivirus($dir,$exs,$matches) {
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if(($handle = @opendir($dir)) == NULL) return false;
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while(false !== ($name = readdir($handle))) {
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if($name == '.' || $name == '..') continue;
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$path = $dir.$name;
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if(is_dir($path)) {
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//chmod($path,0777);/*主要针对一些0111的目录*/
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if(is_readable($path)) antivirus($path.'/',$exs,$matches);
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} elseif(strpos($name,';') > -1 || strpos($name,'%00') > -1 || strpos($name,'/') > -1) {
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echo '特征 <input type="text" style="width:218px;" value="解析漏洞"> '.$path.'<div></div>'; flush(); ob_flush();
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} else {
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if(!preg_match($exs,$name)) continue;
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if(filesize($path) > 10000000) continue;
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$fp = fopen($path,'r');
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$code = fread($fp,filesize($path));
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fclose($fp);
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if(empty($code)) continue;
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foreach($matches as $matche) {
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$array = array();
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preg_match($matche,$code,$array);
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if(!$array) continue;
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if(strpos($array[0],"\x24\x74\x68\x69\x73\x2d\x3e")) continue;
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$len = strlen($array[0]);
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if($len > 6 && $len < 200) {
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echo '特征 <input type="text" style="width:218px;" value="'.htmlspecialchars($array[0]).'"> '.$path.'<div></div>';
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flush(); ob_flush(); break;
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}
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}
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unset($code,$array);
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}
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}
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closedir($handle);
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return true;
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}
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function strdir($str) { return str_replace(array('\\','//','//'),array('/','/','/'),chop($str)); }
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echo '<form method="POST">';
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echo '路径: <input type="text" name="dir" value="'.($_POST['dir'] ? strdir($_POST['dir'].'/') : strdir($_SERVER['DOCUMENT_ROOT'].'/')).'" style="width:398px;"><div></div>';
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echo '后缀: <input type="text" name="exs" value="'.($_POST['exs'] ? $_POST['exs'] : '.php|.inc|.phtml').'" style="width:398px;"><div></div>';
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echo '操作: <input type="submit" style="width:80px;" value="scan"><div></div>';
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echo '</form>';
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if(file_exists($_POST['dir']) && $_POST['exs']) {
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$dir = strdir($_POST['dir'].'/');
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$exs = '/('.str_replace('.','\\.',$_POST['exs']).')/i';
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echo antivirus($dir,$exs,$matches) ? '<div></div>扫描完毕' : '<div></div>扫描中断';
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}
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?>
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