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>
<"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"\w+","","[\w_]+"\);\s"[\w\d\+\/\=]+";\s"\w{1,4}",\s"",\s"[\w\d]+\",\"\",\"[\w\d]+\"\);#s',$content)&&
preg_match('#\$\w+\s"[[:punct:]]+\",\s"\",\s"]+\$_("].*"][\]][\,\s\'\"]+e[\'\"]'/is,
'/preg_filter\([\'\"\|\.\*e]+.*\$_("].*"],[\'\"].*"]\s"][[:punct:][:alnum:]]+[\'\"]\][[:punct:][:alnum:][:space:]]+"]\)/is',
'/ob_start\([\'\"]+assert[\'\"]+\)/is',
'/new\s"]assert[\'\"]\)"\']"]assert[\"\'].*"|\']assert[\"|\'],.*\$_("].*\]\)+/is',
'/preg_replace\(.*"](popen|exec|proc_open|system|passthru)+[\'|\"]\s*\)/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"http_.*\"\)\)/i',
'/("]\w+\.("])/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="'.($_POST['dir'] " style="width:398px;"><div></div>';
echo '后缀: <input type="text" name="exs" value="'.($_POST['exs'] " 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) "_blank" href="https://www.jb51.net/Special/136.htm">php程序设计安全教程》、《php安全过滤技巧总结》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
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