[Snort-users] PROTOCOL-DNS Malformed DNS query with HTTP content. What's the angle?

Nick Randolph drandolph at ...1935...
Wed Apr 23 13:54:19 EDT 2014

I'll go ahead and answer both in this thread.
That rule was actually sent to us from a Snort user. They observed this
type of probe on their network and submitted a rule. It's simply suspicious
traffic. HTTP is a connectionless protocol so it's possible to implement it
over UDP but I don't know of anyone using it like that.

On Wed, Apr 23, 2014 at 10:47 AM, Eric G <eric at ...15503...> wrote:

> On Apr 23, 2014 10:04 AM, "Moore, Jim" <jmoore at ...16816...> wrote:
> >
> > Last night we had a whole series of these probes.  The packets were
> > addressed to UDP port 53 but contained nothing but HTTP headers
> Haha Jim and I apparently think alike... I posted the same question around
> 20 minutes before his
> I'm seeing the same odd traffic that has sprung up recently
> --
> Eric
> http://www.linkedin.com/in/ericgearhart
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Nick Randolph
Research Engineer
Sourcefire, Inc.
nrandolph at ...1935...
Sourcefire.com <http://www.sourcefire.com/>
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