[CLUE-Tech] whats my network doing?

[Keith Hellman]

First things first, make sure your machine is not compromised by comparing
 md5 sums of your /bin directory to your install media.

Otherwise you may well stop this mis-use but not the one in a week when
the nefarious user returns.

If your ls/who/ps has been replaced, you may well not see anything wrong
with your machine, it would be an external indicator tipping you off; as
such was this case (Tx/Rx leds).

--- Roger Frank <rfrank at rfrank.net> wrote:
> Another quiet morning, up at 4 to get some work done before school.  I
> look 
> at the activity lights on the broadband modem connecting my web site
> server 
> to the internet and they are showing a lot of traffic.  Some teacher 
> somewhere is downloading a lesson plan or a project.
> 
> Or maybe not.  I go to the standalone machine that has the web site and
> look at  /var/log/http/access_log and I see two recent attempts with bad
> 
> headers from 217.225.223.158 and 211.195.113.201 along with the usual 
> plethora of attempts by windows viruses.  The /var/log/http/error_log
> records 
> the bad headers.  But what traffic is going now, I wonder, showing up in
> the 
> Tx and Rx leds?  I look at `who` to see that nobody else is logged in. 
> I 
> look at `ps -aux` to see nothing unusual that I can spot.
> 
> How do I see who is getting data from my website while it is happening?
> `ifconfig` shows a lot is happening, but not in enough detail.  I would
> like 
> to know (1) who is accessing me and (2) what they are getting.  My
> concern is 
> that they are getting nothing from me but instead using my machine for 
> nefarious purposes.
> 
> Any clues, cluebies?  What log should I check?  What software tool
> should I 
> use?  Thanks!
> 
> ---
> Roger Frank
> _______________________________________________
> CLUE-Tech mailing list
> CLUE-Tech at clue.denver.co.us
> http://clue.denver.co.us/mailman/listinfo/clue-tech


=====
Keith E. Hellman
kehellman at yahoo.com

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