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[SPAM] Re: DNS Packets
From: rmkml <rmkml () yahoo fr>
Date: Mon, 3 Jun 2013 21:11:08 +0200 (CEST)

Hi Michal,

Please remove "priority:3;"

and please change sid to short like 10000002.

Info: change var to ipvar.

Please check snort cmd line with "-k none" for testing only.

Please check if you need "flow:from_server,established;" on your dns rule.

It's work on last v2.9.4.6.

Regards
@Rmkml


On Mon, 3 Jun 2013, Michal Purzynski wrote:

On 6/3/13 2:57 PM, Mikey van der Worp wrote:

      Hi there

       

      I’ve got several rules.. But non of them are working properly..

       

      “How to detect a DNS Query Reply -> OK”..

      This is something i’ve created a couple of days ago… Doesn’t work as it should be.. This detects “all querys”.. 
Even when its refused…

       Help please!
       == EXAMPLE ==
       var DNS_SERVERS [192.168.1.1]
       var HOME_NETWORK [192.168.0.1/24]
alert udp $HOME_NETWORK,!$DNS_SERVERS 53 -> !$DNS_SERVERS any
(msg: " DNS Query resolved by unknown host."; priority:3;  sid:10000000002;)
       == EXAMPLE ==


Have you born with it, or had an accident?

       

      DEBUG DATA ===

      06/03-14:17:03.732308 50:3D:E5:AF:F1:80 -> 00:00:5E:00:01:50 type:0x800 len:0x149
      127.0.0.1:53 -> 145.100.**.**:32559 UDP TTL:63 TOS:0x0 ID:34600 IpLen:20 DgmLen:315 Len: 287
      23 EF 81 80 00 01 00 05 00 04 00 04 03 77 77 77  #............www
      10 67 6F 6F 67 6C 65 61 64 73 65 72 76 69 63 65  .googleadservice
      73 03 63 6F 6D 00 00 01 00 01 C0 0C 00 05 00 01  s.com...........
      00 00 00 2B 00 1A 06 70 61 67 65 61 64 01 6C 0B  ...+...pagead.l.
      64 6F 75 62 6C 65 63 6C 69 63 6B 03 6E 65 74 00  doubleclick.net.
      C0 36 00 01 00 01 00 00 01 2C 00 04 4A 7D 84 9B  .6.......,..J}..
      C0 36 00 01 00 01 00 00 01 2C 00 04 4A 7D 84 9A  .6.......,..J}..
      C0 36 00 01 00 01 00 00 01 2C 00 04 4A 7D 84 9D  .6.......,..J}..
      C0 36 00 01 00 01 00 00 01 2C 00 04 4A 7D 84 9C  .6.......,..J}..
      C0 3D 00 02 00 01 00 05 40 13 00 0D 03 6E 73 32  .=...... ()     ns2
      06 67 6F 6F 67 6C 65 C0 21 C0 3D 00 02 00 01 00  .google.!.=.....
05 40 13 00 06 03 6E 73 34 C0 A0 C0 3D 00 02 00  . () ns4 = 01 00 05 40 13 00 06 03 6E 73 31 C0 A0 C0 3D 00  ... () ns1 = 02 00 01 00 05 40 13 00 06 03 6E 73 33 C0 A0 C0  ..... () ns3 C7 00 01 00 01 00 02 9D 11 00 04 D8 EF 20 0A C0  ............. ..
      9C 00 01 00 01 00 02 9D 11 00 04 D8 EF 22 0A C0  ............."..
      D9 00 01 00 01 00 02 9D 11 00 04 D8 EF 24 0A C0  .............$..
      B5 00 01 00 01 00 02 9D 11 00 04 D8 EF 26 0A     .............&.

      Sincerely yours,
      Mikey
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