North American Network Operators Group

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Re: RBL for bots?

  • From: Gadi Evron
  • Date: Thu Feb 15 20:08:43 2007

On Thu, 15 Feb 2007 [email protected] wrote:
> On Thu, 15 Feb 2007 11:30:34 EST, Drew Weaver said:
> >     Has anyone created an RBL, much like (possibly) the BOGON list which
> > includes the IP addresses of hosts which seem to be "infected" and are
> > attempting to brute-force SSH/HTTP, etc?

No BL for bots other than SMTP zombies quite yet.

There is one for SSH brute forcing, although home-made.. J. Will repond on
his own...

> > It would be fairly easy to setup a dozen or more honeypots and examine
> > the logs in order to create an initial list.
> A large percentage of those bots are in DHCP'ed cable/dsl blocks.  As such,
> there's 2 questions:

Quite right, which is why ...

> 1) How important is it that you not false-positive an IP that's listed because
> some *previous* owner of the address was pwned?

As in, dynamic ranges BL.

> 2) How important is it that you even accept connections from *anywhere* in
> that DHCP block?

Or maybe the cool concept of white-listing known senders? :)

> (Note that there *are* fairly good RBL's of DHCP/dsl/cable blocks out there.
> So it really *is* a question of why those aren't suitable for use in your
> application...)

Many of them are SMTP-based only. IP reputation is very limited still.

Now, all that said, back on "most are broadband users" - no longer
true. Many bots (especially in spam) are now web servers.