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Re: Spam from weird IP

  • From: Richard D G Cox
  • Date: Mon Jun 16 12:06:35 2003

On Mon, 16 Jun 2003 17:33:11 +0200, "Pascal Gloor" <> wrote:

| Getting SPAM from relayed by ?
| this network is not allocated, nor announced. I have been looking everywhere
| to find if it has been announced (historical bgp update databases, like RIS
| RIPE / CIDR REPORT / etc..)... I didnt found anything.... this probably mean
| is routing that network internaly.

This is very likely to be a known exploit I have been tracking.  In all the
cases which we have so far confirmed, the spam was not relayed, but proxied
by a trojan executable which is able to mimic a "previous" header with such
a degree of accuracy that it is indistinguishable from the genuine article!

| If there is any guy around. Could you please check this?

Our advice would be that the server-that-connected-to-you needs to be taken
offline by the security people at its site (which you say is RoadRunner) and
they should have ALL its disk(s) imaged for forensic analysis purposes.

Our experience is that sites hit by this exploit will do basic checks on
the server and claim it is uncompromised and "cannot possibly be sending
that spam".  Such a claim would be entirely incorrect.  You would need to
persuade them that something is wrong, which is difficult at the best of
times.  RoadRunner being involved in this case suggests this may *not* be
the "best of times".

Richard Cox

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