RE: AOL Instant Messenger signature?

[Dan Fiorito <danf () clearnetwork com>]

Many of our users where smart enough to change the default port of 5190 to
say 21.

-----Original Message-----
From: Blake Frantz [mailto:blake () mc net]
Sent: Tuesday, May 01, 2001 2:43 PM
To: Jones, Benny
Cc: 'snort-users () lists sourceforge net'
Subject: Re: [Snort-users] AOL Instant Messenger signature?



Hello,

I spent about 30 mins playing and came up with the following:

   - AIM 3.0 defaults to port 5190/tcp
   - All packets we set to DF (Do not Fragment)
   - The payload always started with "2A 02"

alert tcp $EXTERNAL_NET 5190 -> $HOME_NET 1024: (msg:"AOL Instant Messager -
Inbound"; content:"|2A 02|"; offset:0; depth:2; fragbits:D;) 
alert tcp $HOME_NET 1024: -> $EXTERNAL_NET 5190 (msg:"AOL Instant Messager -
Outbound"; content:"|2A 02|"; offset:0; depth:2; fragbits:D;) 

If anyone can improve this or find any instances which cause this rule
to fail, please speak up.

Blake Frantz

================================================================= 
The Government, like diapers, should be replaced regularly, and
often for the same reasons. 

On Mon, 16 Apr 2001, Jones, Benny wrote:

> Fellow snorters...
>
> Is there a signature to detect AIM activity?
> I couldn't find one on www.snort.org or
> www.whitehats.com.
>
> Thanks in advance.
>
> Benny
>
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