random dns queries with random sources

Wed Feb 19 03:19:17 UTC 2014

I couldn't resolve that domain or subdomains that I tried.

If that domain did respond, I'd guess it's tailored to be a large junky 
response.  Varying the qname prevents people from using iptables to 
block specific queries.

On 2/18/2014 10:08 PM, Joe Maimon wrote:
> Hey all,
>
> DNS amplification spoofed source attacks, I get that. I even thought I 
> was getting mitigation down to acceptable levels.
>
> But now this. At different times during the previous days and on 
> different resolvers, routers with proxy turned on, etc...
>
> Thousand of queries with thousands of source ip addresses.
>
> According to my logs, sources are not being repeated (or not with any 
> significant frequency)
>
> What is the purpose of this?
>
> 18-Feb-2014 21:45:24.982 queries: info: client 38.89.3.12#19391: 
> query: swe.5kkx.com IN A + (66.199.132.5)
> 18-Feb-2014 21:45:25.067 queries: info: client 4.109.210.187#55190: 
> query: ngqrbwuzquz.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:25.105 queries: info: client 91.82.209.221#33924: 
> query: bgbtqcdtzen.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:25.106 queries: info: client 6.29.8.224#4379: query: 
> uehkaiy.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:25.106 queries: info: client 67.27.41.169#44000: 
> query: yqv.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:25.107 queries: info: client 45.207.31.218#30585: 
> query: e.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:25.644 queries: info: client 95.217.89.95#5396: 
> query: bfpofpj.5kkx.com IN A + (66.199.132.5)
> 18-Feb-2014 21:45:25.823 queries: info: client 89.47.129.187#12316: 
> query: aocdesguijxym.5kkx.com IN A + (66.199.132.5)
> 18-Feb-2014 21:45:26.021 queries: info: client 15.205.106.62#34265: 
> query: xqgyahfugnt.5kkx.com IN A + (66.199.132.7)
> 18-Feb-2014 21:45:26.057 queries: info: client 128.64.33.29#7584: 
> query: ijwhqfmpohmj.5kkx.com IN A + (216.222.148.103)
> 18-Feb-2014 21:45:26.330 queries: info: client 102.206.85.254#8093: 
> query: ibojknsrqjohib.5kkx.com IN A + (216.222.148.103)
> 18-Feb-2014 21:45:26.333 queries: info: client 40.121.221.81#10822: 
> query: ebb.5kkx.com IN A + (66.199.132.5)
> 18-Feb-2014 21:45:26.752 queries: info: client 104.55.169.43#30108: 
> query: l.5kkx.com IN A + (66.199.132.7)
>