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Something changing DNS server settings
From: Shannon (bip0dbrm001SNEAKEMAIL.COM)
Date: Tue Sep 30 2003 - 23:07:22 CDT
We're having a strange thing in our domain. Various Windows 2000 professional workstations are changing the DNS servers they are configured to use. So far observed are spontantiously changing to 18.104.22.168 and 22.214.171.124. (Neither IP correctly reverse looks up, but both are hosted on "ev1.net") Due to our network topology, this breaks things pretty quickly as these servers cannot resolve our internal DNS. The former address is still responding as a DNS server, but the second is not as far as I can tell.)
Resetting the computer to autodetect the DNS server (use DHCP) restores the computer to normal funcitonality.
However, I strongly suspect a worm, virus or some kind of delibrate targeted attack. (Latest NAV defs are unable to detect anything on an affected machines as yet.) When I looked in the registry of one of the affected computers, I found this:
(as a trimmed exported registry file)
You'll notice that "windows" with "r0x" = "your s0x" which is pretty clear evidence of some kind of ne'er do well. I'm not sure if it's a local worm or something taking advantage of remote registry services or something, but it's not good. And the NameServer is supposed to be blank indicating automatic DHCP configuration.
(Changing the local machine's config in the network control panel appears to reset the entire hklm\system\ccs\services\parameters\intefaces key, removing this "r0x" entry.)
Anyone aware of anything that has this kind of behaviour? And what do I do to fix it? And what else has this thing done? So far, it has happened on four machines in our office.
I'll forward more information if I find any.
Thanks in advance,
(if this email doesn't work, smccracken-at-tonkin-dot-co-dot-nz, but this address should work fine.)
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