Security Incidents mailing list archives

Re: Distributed scan (src port 23) of our whole class C network


From: Glenn Forbes Fleming Larratt <glratt () IO COM>
Date: Tue, 23 Jan 2001 21:29:38 -0600

We are observing this as well in our class B (which I'm not to
communicate), from all four addresses listed below and no others
so far.

Have the owners of these addresses been notified?

        -g

On Tue, 23 Jan 2001, Ralf G. R. Bergs wrote:

Hi there,

there's currently a distributed scan going on across our whole class C network
(contained in the class B network 131.188.0.0/16.)

The scanning machines send TCP packets with a source port of 23. The source IP
addresses I've seen so far are

  134.53.215.184 (ip134-053-215-184.s215.muohio.edu)
  216.22.151.67 (fortress.omnicon.net)
  209.220.244.18 (w018.z209220244.chi-il.dsl.cnc.net)
  209.240.174.2 (apollo.netwest.com)

Anyone else seen similar things going on?

Ralf


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