full-disclosure - Mystery DNS Changes

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Message-ID: <6130FAF67D15D411BF7100E01899071F865EA3@stork.mightyoaks.local>
From: david.vincent at mightyoaks.com (David Vincent)
Subject: Mystery DNS Changes

it was said....

------------------
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? 
------------------

check here:
http://isc.sans.org/diary.html?date=2003-10-01

------------------
DNS abnormalitities

As initially posted to the SANS intrustions list, some sites observe an
increase in abnormal DNS queries. For the original post, see
http://cert.uni-stuttgart.de/archive/intrusions/2003/10/msg00003.html

A likely related issue has been reported to NT Bugtraq:
http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind0310&L=ntbugtraq&D=0
&F=P&P=1048

Here, a user reported that "Various Windows 2000 professional workstations
are changing the DNS servers they are configured to use". The new DNS
server, 216.127.92.38 and 69.51.146.14, is hosted by 'Everyone's Internet
Inc.', (ev1.com).

This user did report suspicous changes to the registry:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Inter
faces\windows]
"r0x"="your s0x"
"NameServer"="69.57.146.14"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Inter
faces\{45F95E82-B443-428B-9EB7-4C65CDCD9006}]
"T2"=dword:3e057410
"LeaseTerminatesTime"=dword:3e067130
"LeaseObtainedTime"=dword:3dfe8830
"T1"=dword:3e027cb0
"NameServer"="69.57.146.14"

for more details, see this NT Bugtraq post:
http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind0310&L=ntbugtraq&D=0
&F=P&P=1879

------
If you would like to share any related logs, please send them to
isc_AT_sans.org 
------------------

...and someone else on NTBugTraq said...

------------------
The top DNS server change was made by a newer variant of the 
Delude/Startpage trojan. It used to add bogus entries in the 
system32\drivers\etc\hosts file, but lately has begun to change the 
user's DNS registry settings as well. It hijacks the user's traffic to 
and from major search engines, redirecting it to a single webserver 
under the control of the trojan author. Any requested search pages have 
popup ads for gambling/porn site registration, presumably because the 
trojan author is getting money for registrations via affiliate 
programs.

It is being installed via the MS03-032 IE object tag exploit. A scan of 
the system may not turn up any infected files - this trojan does not 
run at startup, and deletes its files after the DNS/hosts configuration 
changes are complete.
------------------


-d