Check the Settings for the browsers, perhaps they were forced to use a
proxy that was listening on the loopback?
Check your DNS settings with ipconfig /all as well.
Look at what is set to run at startup via the registry. Chances are that
the exe's will resides in C:\Windows\system32 and may look innocent.
Grab a list of the names and google to find out more info.
You could spend a lot more time looking through the system but all in
all you should assume that the machine needs to be wiped and reloaded.
Does the user *need* admin rights?
HTH,
Harry
--
Harry Hoffman
Integrated Portable Solutions, LLC
877.846.5927 ext 1000
http://www.ip-solutions.net/
belka@att.net wrote:
While setting a port for Symantec to query XP Pro workstations for virus
updates, I noticed two machines that had firewall rules (exceptions in WinXP
firewall parlance) that were in unreadable charcaters, such as an asian font
set that couldn't be displayed. The rule name was in blocks or in other
unreadable characters. The user of these two workstations is notorious for
downloading asian TV shows over bit torrent, and visiting anime and other
asian sites.
I deleted the two firewall rules (DOH! I should have just disabled them) and
now IE and Mozilla browsers do not work at all. I can ping out of these two
machines, and as long as I use an IP address, these machines can ping
anywhere in the Internet. However, if any call to DNS is requires, either
with a browser or ICMP, it fails.
Has anyone had a similar experience or seen this kind of behavior. My fear
is that one of the "special Korean download programs" that this user admits
installing has altered the browser or -- even worse - the XP TCP/IP stack
with hooks into a trojan or spyware product. I tried disabling the firewall
to allow all traffic in and out, but to no effect. No DNS functionality. My
packet traces are inconclusive and my IDS is not alerting on anything in or
out of these two work stations.
Any ideas? At this point I know I am going to have to reload, but from a
forensic stand point, I am curious if any one else has seen this kind of
beavior before.
Thanks.
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security environment. Featuring 36 hands-on training courses and 10 conference
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