Thank you Dan for your answer.

I have run an md5sum on my monitored server and another on an isolated
machine : they are identical ... Ouf !

Thank you.

Best regards.

On 21 oct, 15:07, "dan (ddp)" <ddp...@gmail.com> wrote:
> OSSEC tries to bind to the port and checks the output of netstat and
> compares the results. If they don't match up it reports it.
> This could be a sign that a process had bound to a port when it
> checked the first part, and the process was dead when it tried the
> second check.
>
> It could also mean that netstat has been changed out with a "bad"
> version. Check the md5 of the netstat command to make sure it hasn't
> changed.
>
> On Tue, Oct 19, 2010 at 10:36 AM, tux3132 <tux3...@gmail.com> wrote:
> > Hi
>
> > I have this level 7 alert fired by #510 rule:
>
> > Port '40848'(tcp) hidden. Kernel-level rootkit or trojaned version of
> > netstat
>
> > No over alerts of this level since one month ...
>
> > Is this a false positive ? (I hope ... )
>
> > Best regards.

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