RE: Unusual volume: UDP:137 probes

From: Brett Procter (Brett.Procterat_private)
Date: Mon Sep 30 2002 - 05:05:28 PDT

  • Next message: Keith T. Morgan: "RE: Increase in SSH scans"

      Hmm,
    
        Internode ADSL (Adelaide Aust)
    
      15 hits yesterday, 38 so far today (22:04 GMT+10), 1 from local
    network yesterday, 5 today.
    
      Brett Procter
      Config Systems Pty Ltd
    
    > -----Original Message-----
    > From: Mark Forsyth [mailto:forsythmat_private]
    > Sent: Monday, 30 September 2002 6:33 PM
    > To: incidentsat_private
    > Subject: RE: Unusual volume: UDP:137 probes
    > 
    > 
    > On Monday, September 30, 2002 9:02 AM, John Sage
    > [SMTP:jsageat_private] wrote:
    > > This has received some mention on the UNISOG list and elsewhere, but
    > > not here.
    > >
    > > Some people have been seeing unusually high volumes of UDP:137
    probes
    > > since about 09/27/02 late, or early 09/28/02.
    > 
    > A few people (who log sych things) on the Optus cable network in
    Australia
    > have been seeing it too.
    > In my case since Sep 20 it's gone ...
    > Sep 20  2 hits
    > Sep 21, 22, 23 0 hits
    > Sep 24 3 hits
    > Sep 25 0 hits
    > Sep 26 4 hits
    > Sep 27 2 hits
    > Sep 28 156 hits Starting at 02:20 (Aust. EST)
    > Sep 29 410 hits
    > Sep 30 406 hits up until 18:24
    > 
    > 
    > >
    > > Funny facts: almost no duplication of source IP address, unless the
    > > source IP is very close to your own.
    > 
    > Same here.
    > 
    > >
    > > Packet contents seem to be "normal".
    > 
    > Yep. Look normal here too.
    > 
    > >
    > > ACID summaries for my dialup into AT&T's Seattle WA POP follow.
    > >
    > > One list is sorted by date-time, the other's sorted by source IP --
    > > the list sorted by source IP suggests that I'm being probed several
    > times
    > > by IP's in my 12.82.x.x neigborhood, and almost never more than once
    > > by IP's from other netblocks.
    > 
    > Almost no duplicates here either. An interesting thing is that there
    are
    > almost no addresses in my logs that are in .au land.
    > It'd be interesting if someone on a well connected network would
    configure
    > up a Win95 box as a honeypot and see what happens. For me to do it
    would
    > probably be a waste of time as Optus blocks most NetBIOS ports. They
    just
    > omitted to block 137 UDP for some reason.
    > 
    > Ooroo
    > Mark Forsyth
    > 
    >
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