[Snort-users] a lot of Loopback traffic being logged.

Chuck Holley cholley at ...11679...
Fri Apr 23 10:25:12 EDT 2004


Did you sniff for 127.0.0.1 packets?  Im using tcpdump and I sniffed for a
while with this command:  tcpdump src 127.0.0.1 -s 1518 -i eth0 -w dump

Im assuming im doing this right.  Im trying to log only packets form
127.0.0.1 and log the whole Ethernet packet 1518 on interface eth0 and write
to a file called dump.

Now, I did this and got two loggings in tcpdump:

13:04:11.172652 IP hal2.http > 192.168.42.50.1361: R 0:0(0) ack 799408129
win 0
13:04:54.391786 IP hal2.http > 192.168.42.52.1196: R 0:0(0) ack 1316880385
win 0

hal2 is the server that has tcpdump on it. Is this machine one of the boxes
that is sending out the 127.0.0.1, or did I simply pickup two packets sent
out form hal2 to these other machines. 

I looked at snort and the exact same ip's, with the exact same ports were
logged coming from 127.0.0.1

To say the least im confused even more!!



-----Original Message-----
From: Fred Portnoy [mailto:fportnoy at ...1527...] 
Sent: Friday, April 23, 2004 11:07 AM
To: 'Chuck Holley'; Mark.Schutzmann at ...10439...
Cc: snort-users at lists.sourceforge.net;
snort-users-admin at lists.sourceforge.net
Subject: RE: [Snort-users] a lot of Loopback traffic being logged.

You need to sniff on one interface at a time at your network distribution
point, and as you find the offending packets, go upstream to the next
aggregation point and so forth, until you get by the last router and you are
on the offender's home LAN; only then will you have captured their actual
mac address. Good Luck!

-fp

-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] On Behalf Of Chuck Holley
Sent: Friday, April 23, 2004 10:25 AM
To: Mark.Schutzmann at ...10438...
Cc: snort-users at lists.sourceforge.net;
snort-users-admin at lists.sourceforge.net
Subject: RE: [Snort-users] a lot of Loopback traffic being logged.


OK, I looked through the archives and found that it is probably the balaster
worm, and that to find the src address you need to follow back to the MAC
address.  My problem is that I have firestarter firewall on my mailserver
and it is also logging the loopback address issue as a "Martian source
attack," and I have two different IP addresses mapped to the same MAC
address??????  What is up with that?  How do I trace that?  

Also I cant seem to find where the MAC address is in ACID.

-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] On Behalf Of
Mark.Schutzmann at ...10438...
Sent: Thursday, April 22, 2004 6:09 PM
To: Chuck Holley
Cc: snort-users at lists.sourceforge.net;
snort-users-admin at lists.sourceforge.net
Subject: Re: [Snort-users] a lot of Loopback traffic being logged.


I reported this same problem earlier. I had a lot of great feedback, if you
want to search the mailing list. Recently, I had this come up again. I used
Snort in non-daemon mode to find the MAC address that was associated with
the 127.0.0.1 address, which lead me to a router (ugh!), I then had to trace
that through my WAN to another network, where we found the local MAC and
traced that to a couple of Japanese engineers who were visiting our company
and had plugged their computers into our network. Unfortunately, because we
did not have a translator and could not readily sift through their Japanese
OS computers, I still cannot say what the source program was that caused
this. I simply had to quarantine their computer away from the corporate
network. If I find a translator and the program, I will forward this info
on. Let me know what you find! I suspect some virus or trojan. This is a
fairly amateur attack to actually be running manually. Good Luck!

Best Regards,
Mark


 

                      "Chuck Holley"

                      <cholley at ...11679...>          To:
<snort-users at lists.sourceforge.net>

                      Sent by:                            cc:

                      snort-users-admin at ...4626...        Subject:
[Snort-users] a lot of Loopback traffic being logged.

                      ceforge.net

 

 

                      04/22/2004 08:38 AM

 

 





"BAD-TRAFFIC loopback traffic"  I am getting a lot of this one alert on
127.0.0.1.  im really not sure what is causing this.  If it is faulty
networking or maybe a spoofer.  Now that I know im getting this, thanks to
SNORT, what the heck do I do about it?  Anyone ever remedy this problem?

Chuck Holley
LAN Administrator
FitnessQuest Inc.
Canton, OH
cholley at ...11679...








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