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Detailed explanation of how webshell scans files for Trojans in PHP
Backend Development
PHP Tutorial
Detailed explanation of how webshell scans files for Trojans in PHP
Detailed explanation of how webshell scans files for Trojans in PHP
php
web
webshell
这篇文章主要介绍了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
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
代码如下：
<!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"> '.$path.'<p></p>'; flush(); ob_flush();
}
else {
if(!preg_match($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"> '.$path.'<p></p>'; flush(); ob_flush();
}elseif(callbackshell($path)){
echo '特征 <input type="text" style="width:250px;" value="Callback shell"> '.$path.'<p></p>'; flush(); ob_flush();
}
foreach($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]).'"> '.$path.'<p></p>';
flush(); ob_flush(); break;
}
}
unset($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($_SERVER['DOCUMENT_ROOT'].'/')).'" style="width:398px;"><p></p>';
echo '后缀: <input type="text" name="exs" value="'.($_POST['exs'] ? $_POST['exs'] : '.php|.inc|.phtml').'" style="width:398px;"><p></p>';
echo '操作: <input type="submit" style="width:80px;" value="scan"><p></p>';
echo '</form>';
if(file_exists($_POST['dir']) && $_POST['exs']) {
$dir = strdir($_POST['dir'].'/');
$exs = '/('.str_replace('.','\\.',$_POST['exs']).')/i';
echo antivirus($dir,$exs,$matches) ? '</br ><p></p>扫描完毕!' : '</br > <p></p>扫描中断';
}
?>
</html>Copy after login
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