Tightened DNS security question re: DNS amplification attacks.

Graeme Fowler graeme at graemef.net
Wed Jan 28 08:32:11 CST 2009


Hi

On Wed, 2009-01-28 at 13:16 +0100, fredrik danerklint wrote:
> At 12:07:16 local time here in sweden, I saw a new address 70.86.80.98.
> At 12:09:36 another new address 64.57.246.123 
> At 12:20:10 the address 70.86.80.98 started to ask for funny domain name like:
> "pjphcdaaaafwu0000dgaaabaaacboinf". This ended at 12:55:01 when it was back to 
> just ask for the .NS records again.

Same here - times different, though, in that it appeared at 1120 UTC and
disappeared at 1159 UTC. There were 194 entries.

Every query was the same format - a 32-byte lower case alphanumeric
string, differing at the following positions marked with a period:

......aaaafw.0000d.aaabaaa......

I expect that others will have seen similar patterns with differing
fixed strings.  I'm also starting to wonder if this is something to with
the downadup/conficker worm, or another botnet.

Graeme





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