Re: Strange broadcasts to printer port

["Crist Clark" <crist.clark () globalstar com>]

Mike Patchen wrote:
> I have been seeing a lot of these too (5-7 per day).  Snort identifies them as "BACKDOOR Q access".  The only 
> difference that I see is that the TOS is 0x00 in my logs.  I usually see these as a scan across my IP range, instead 
> of being targeted at a certain machine.

I've seen 182 of these. The first one came in on April 16th of this year.
They have hit 164 different hosts, no host has been hit more than twice, 
which is reasonable for totally random scans.

> > > > Patrick Oonk <patrick () pine nl> 06/28/01 09:27AM >>>
> Hi,
>
> I have been seeing syn packets from src 255.255.255.255:31337 to random
> ip-numbers port 515 in our nets for months.  Does anyone kow what could cause this?

I don't know, but I find these things humorous more than anything
else. I mean, could it be _any_ more obvious these are crafted packets?
We have the 'leet source port. We have a sequence numebr of 100 everytime.
We have the same IP ID everytime, 62128. And then of course, the source
address is The Broadcast Address. So, not only are they blatently obvious
and should set off every NIDS ever made, but they are harmless. There
is no way the recipient could ever find the sender (even if it wanted to
reply to a SYN from 255.255.255.255) if it's not local.

My _guess_ has always been that these are the result of some broken
worm or other tool. However, I do not see how such a worm could ever
propigate. I never see attacks with this signature except including
a valid source address.
-- 
Crist J. Clark                                Network Security Engineer
crist.clark () globalstar com                    Globalstar, L.P.
(408) 933-4387                                FAX: (408) 933-4926

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