Re: suspicious firewall rules in WinXP firewall

["Jamie Riden" <jamesr () europe com>]

On 04/07/06, kent crispin <kent () songbird com> wrote:
> It appears that perhaps the resolver software/configuration has been altered
> so that dns queries will go to alternate root servers.  I would be very
> curious to know what addresses dns queries are actually trying to hit...

Well, 'alternate root' in some sense. If I was such an attacker I
would resolve most stuff correctly, but perhaps give incorrect answers
for ebay, banking sites and similar. Without knowing, it's better to
assume the worst.

This happened to some machines on campus a few years ago and we
responded by blocking 53/tcp and /udp outbound and insisting that
everyone use our central DNS servers to resolve queries. (Which, btw,
they should have already been doing as everything was configured via
DHCP.) You could probably achieve the same by redirecting web traffic
at the proxy level, so it pays to keep an eye on that, too.

cheers,
Jamie
--
Jamie Riden / jamesr () europe com / jamie.riden () computer org
NZ Honeynet project - http://www.nz-honeynet.org/

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