full-disclosure - Mystery DNS Changes

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Message-ID: <B24F5C4EDA48D511B6CB00508BDFC19403D20470@NYEXCHCLSTR>
From: JBrown at thrupoint.net (Brown, James (Jim))
Subject: Mystery DNS Changes

-----Original Message-----
From: Hansen, Kevin
To: 'full-disclosure@...ts.netsys.com'
Sent: 10/1/03 3:19 PM
Subject: [Full-Disclosure] Mystery DNS Changes

We have seen multiple instances where DHCP enabled workstations have had
their DNS reconfigured to point to two of the three addresses listed
below. Can anyone else confirm this? Incidents.org is reporting an
increase in port 53 traffic over the last two days. Are we looking at
the precursor to the next worm?

216.127.92.38 
69.57.146.14 
69.57.147.175 

Are these entries coming in the DHCP packets or are they being
set *after* DHCP is complete?  Are compromised systems acting
like DHCP servers stuffing their own DNS entries into
specially crafted replies?

Can you post traffic dumps?

Best Regards,
jpb
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