Security Incidents: Re: Logs showing GET /.hash=...

[Jim Dueltgen <jimd () lmi net>]

I've been working recently with Cisco's Network Based Application 
Recognition (NBAR) trying to keep Kazaa traffic under control in a 
multi-tenant installation and I've only ever found this snippet in 
the documentation:
2.  KaZaA version 2 might use port 80 to get around the Firewall. You 
can control it be adding
match protocol http url \.hash=*

I'm not sure about the \ vs / as it shows in your logs and as one 
would expect to see in a URL but the above is what's in Cisco's 
documentation.  My understanding is that the actual download of a 
file via kazaa v2 happens over port 80 in an attempt to get around 
passive packet filtering firewalls.
Regards,

Jim Dueltgen
  LMi.net

At 9:54 AM -0400 4/30/03, Keith Bergen wrote:
> I have seen log entries in the form:
> dormtw.isu.edu.tw - - [29/Apr/2003:22:04:17 -
> 0400] "GET /.hash=8a8a30842bc6698dd1cbcb31191fc9e76018ea4c
> HTTP/1.1" 404 323
> dormtw.isu.edu.tw - - [29/Apr/2003:22:04:22 -
> 0400] "GET /.hash=355bcee01e59b87d9cc33d4ae3cc8edf5f022d2a
> HTTP/1.1" 404 323
> dormtw.isu.edu.tw - - [29/Apr/2003:22:04:24 -
> 0400] "GET /.hash=51f6ec2b496fa6fac83a88d7978321c7b64a5969
> HTTP/1.1" 404 323
>
> I looked at past posts, and one indicates that this might be
> KaZaa traffic. The other post indicated it was "WinMX". Can
> somebody expand on this? For example, what is WinMX? Also,
> why would KaZaa connect to port 80?
>
> Thanks,
> Keith.
>
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