isprime DOS in progress

Luke Sheldrick luke at sheldrick.co.uk
Fri Jan 23 14:20:35 CST 2009


Looks to me like the target has moved, anyone else seeing similar?

Jan 23 20:19:08 LND02 named[9611]: client 63.217.28.226#39489: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:09 LND02 named[9611]: client 63.217.28.226#20558: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:11 LND02 named[9611]: client 63.217.28.226#38525: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:12 LND02 named[9611]: client 63.217.28.226#41535: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:12 LND02 named[9611]: client 63.217.28.226#51220: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:13 LND02 named[9611]: client 63.217.28.226#28869: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:14 LND02 named[9611]: client 63.217.28.226#12337: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:15 LND02 named[9611]: client 63.217.28.226#41346: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:15 LND02 named[9611]: client 63.217.28.226#56831: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:17 LND02 named[9611]: client 63.217.28.226#13352: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:18 LND02 named[9611]: client 63.217.28.226#55466: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:18 LND02 named[9611]: client 63.217.28.226#24586: view
external: query (cache) './NS/IN' denied
Jan 23 20:19:19 LND02 named[9611]: client 63.217.28.226#43105: view
external: query (cache) './NS/IN' denied



On Fri, 2009-01-23 at 19:46 +0000, Steven Lisson wrote:
> Hi,
> 
> I agree with seeing no traffic to/from 66.230.128.15 but am still seeing flows 'from' 66.230.160.1
> 
> Regards,
> Steve
> 
> -----Original Message-----
> From: Phil Rosenthal [mailto:pr at isprime.com]
> Sent: Saturday, 24 January 2009 4:12 AM
> To: nanog at nanog.org
> Subject: Re: isprime DOS in progress
> 
> Just a friendly notice, the attack against 66.230.128.15/66.230.160.1
> seems to have stopped for now.
> 
> -Phil
> On Jan 22, 2009, at 6:01 AM, Bjørn Mork wrote:
> 
> > Graeme Fowler <graeme at graemef.net> writes:
> >
> >> I've been seeing a lot of noise from the latter two addresses after
> >> switching on query logging (and finishing an application of Team
> >> Cymru's
> >> excellent template) so I decided to DROP traffic from the addresses
> >> (with source port != 53) at the hosts in question.
> >>
> >> Well, blow me down if they didn't completely stop talking to me. Four
> >> dropped packets each, and they've gone away.
> >>
> >> Something smells "not quite right" here - if the traffic is
> >> spoofed, and
> >> my "Refused" responses have been flying right back to the *real* IP
> >> addresses, how are the spoofing hosts to know that I'm dropping the
> >> traffic?
> >
> > Did you filter *only* 66.230.128.15/66.230.160.1, or are you dropping
> > traffic from other sources too?  Looks like some of the other source
> > addresses are controlled by the DOSers. Possibly used to detect
> > filters?
> >
> > These clients may look similar to the DOS attack, but there are subtle
> > differences:
> >
> > Jan 18 05:08:33 canardo named[32046]: client 211.72.249.201#29656:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 05:08:33 canardo named[32046]: client 211.72.249.201#29656:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 05:08:34 canardo named[32046]: client 211.72.249.201#29656:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 05:47:00 canardo named[32046]: client 211.72.249.201#29662:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 05:47:01 canardo named[32046]: client 211.72.249.201#29662:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 05:47:01 canardo named[32046]: client 211.72.249.201#29662:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 06:25:22 canardo named[32046]: client 211.72.249.201#29664:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 06:25:22 canardo named[32046]: client 211.72.249.201#29664:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 06:25:23 canardo named[32046]: client 211.72.249.201#29664:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:03:41 canardo named[32046]: client 211.72.249.201#29667:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:03:41 canardo named[32046]: client 211.72.249.201#29667:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:03:42 canardo named[32046]: client 211.72.249.201#29667:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:42:08 canardo named[32046]: client 211.72.249.201#29670:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:42:09 canardo named[32046]: client 211.72.249.201#29670:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 07:42:09 canardo named[32046]: client 211.72.249.201#29670:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:20:29 canardo named[32046]: client 211.72.249.201#29673:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:20:29 canardo named[32046]: client 211.72.249.201#29673:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:20:30 canardo named[32046]: client 211.72.249.201#29673:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:58:50 canardo named[32046]: client 211.72.249.201#29678:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:58:51 canardo named[32046]: client 211.72.249.201#29678:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 08:58:51 canardo named[32046]: client 211.72.249.201#29678:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 09:37:12 canardo named[32046]: client 211.72.249.201#29679:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 09:37:12 canardo named[32046]: client 211.72.249.201#29679:
> > view external: query (cache) './NS/IN' denied
> > Jan 18 09:37:13 canardo named[32046]: client 211.72.249.201#29679:
> > view external: query (cache) './NS/IN' denied
> >
> > Jan 20 07:02:51 canardo named[32046]: client 213.61.92.192#46716:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 07:02:51 canardo named[32046]: client 213.61.92.192#46716:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 07:02:51 canardo named[32046]: client 213.61.92.192#46716:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 07:41:21 canardo named[32046]: client 213.61.92.192#46752:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 07:41:21 canardo named[32046]: client 213.61.92.192#46752:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 07:41:21 canardo named[32046]: client 213.61.92.192#46752:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:19:46 canardo named[32046]: client 213.61.92.192#46785:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:19:46 canardo named[32046]: client 213.61.92.192#46785:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:19:46 canardo named[32046]: client 213.61.92.192#46785:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:58:12 canardo named[32046]: client 213.61.92.192#46808:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:58:12 canardo named[32046]: client 213.61.92.192#46808:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 08:58:12 canardo named[32046]: client 213.61.92.192#46808:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 09:36:34 canardo named[32046]: client 213.61.92.192#46833:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 09:36:34 canardo named[32046]: client 213.61.92.192#46833:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 09:36:34 canardo named[32046]: client 213.61.92.192#46833:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 10:14:58 canardo named[32046]: client 213.61.92.192#46858:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 10:14:58 canardo named[32046]: client 213.61.92.192#46858:
> > view external: query (cache) './NS/IN' denied
> > Jan 20 10:14:58 canardo named[32046]: client 213.61.92.192#46858:
> > view external: query (cache) './NS/IN' denied
> >
> > Jan 22 06:27:28 canardo named[32046]: client 66.238.93.161#34373:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 06:27:28 canardo named[32046]: client 66.238.93.161#34373:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 06:27:28 canardo named[32046]: client 66.238.93.161#34373:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:05:55 canardo named[32046]: client 66.238.93.161#34420:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:05:55 canardo named[32046]: client 66.238.93.161#34420:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:05:55 canardo named[32046]: client 66.238.93.161#34420:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:44:20 canardo named[32046]: client 66.238.93.161#34473:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:44:20 canardo named[32046]: client 66.238.93.161#34473:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 07:44:21 canardo named[32046]: client 66.238.93.161#34473:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 08:22:38 canardo named[32046]: client 66.238.93.161#34503:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 08:22:38 canardo named[32046]: client 66.238.93.161#34503:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 08:22:38 canardo named[32046]: client 66.238.93.161#34503:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:00:56 canardo named[32046]: client 66.238.93.161#34540:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:00:56 canardo named[32046]: client 66.238.93.161#34540:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:00:56 canardo named[32046]: client 66.238.93.161#34540:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:39:20 canardo named[32046]: client 66.238.93.161#34574:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:39:21 canardo named[32046]: client 66.238.93.161#34574:
> > view external: query (cache) './NS/IN' denied
> > Jan 22 09:39:21 canardo named[32046]: client 66.238.93.161#34574:
> > view external: query (cache) './NS/IN' denied
> >
> >
> > Notice the pattern:
> > 3 probes every 38 minutes
> > Each probe from the same source port
> > Source port increases slowly and steadily
> >
> > This looks like some application actually waiting for a response.  The
> > slow source port change is probably an indication that this client
> > only
> > tests a small number of DNS servers.  I guess that this client is
> > either
> > one of the many bots used to send the spoofed requests, or maybe a bot
> > not allowed to spoof its source and therefore used for other
> > purposes. In any case, I assume that other DNS servers may see such
> > control sessions coming from other addresses.
> >
> > These 3 clients started probing my DNS server almost simultaneously
> > on January 8th:
> >
> >
> > Jan  8 19:33:52 canardo named[26496]: client 213.61.92.192#31195:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:33:52 canardo named[26496]: client 213.61.92.192#31195:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:33:52 canardo named[26496]: client 213.61.92.192#31195:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:36:29 canardo named[26496]: client 66.238.93.161#11299:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:36:29 canardo named[26496]: client 66.238.93.161#11299:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:36:30 canardo named[26496]: client 66.238.93.161#11299:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:37:47 canardo named[26496]: client 211.72.249.201#29112:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:37:47 canardo named[26496]: client 211.72.249.201#29112:
> > view external: query (cache) './NS/IN' denied
> > Jan  8 19:37:47 canardo named[26496]: client 211.72.249.201#29112:
> > view external: query (cache) './NS/IN' denied
> >
> > Maybe preparing for the attack on ISPrime?  I didn't start receiving
> > spoofed requests from 66.230.128.15/66.230.160.1 before January 20th
> >
> >
> > I just tried filtering the probing addresses.  This made the probing
> > stop immediately after dropping a set of 3 probes.  But the spoofed
> > requests continuted at the same rate as before, so this does not
> > support
> > my theory.
> >
> > However, I believe it would be too much of a coincidence if there
> > isn't
> > some connection between the probing and the DOS attack.  It would be
> > interesting to hear if others see similar probing.
> >
> >
> >
> > Bjørn
> >
> 
> 
> 





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