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>
<?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,'