Re: Am I infected with a rootkit?

From	Jesper Dybdal <jd-debian-user@dybdal.dk>
Newsgroups	linux.debian.user
Subject	Re: Am I infected with a rootkit?
Date	2023-04-18 15:50 +0200
Message-ID	<GlTSx-2RK6-1@gated-at.bofh.it> (permalink)
References	<Gl9G1-2pKU-1@gated-at.bofh.it> <Gl9Zn-2pRY-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2023-04-16 14:19, I wrote:
> ...
> And there in the bash history were 4 lines that I had not written :-(

To summarize:

* Greg has convincingly argued that there is no way for the running 
shell to get those lines into its history, other than by issuing them 
over the ssh connection.

* We can therefore assume that the problem originated at the Windows 
machine (the ssh client).

* It seems that an intruder has had control over the Windows machine, 
including the ssh session, and thus, at least in principle, could have 
done harm also to the Linux machine.

* There is, however, no sign of an infection of the Linux machine. And 
the 4 lines do not suggest that whoever issued them knows what he's doing.

* So I am going to assume that the Linux machine is ok.

* The Windows machine could be infected with something that allows 
remote control.

* So I should probably reinstall the Windows machine from scratch - or 
perhaps restore a really old backup (I have one from July 2022, one from 
2020, and one taken shortly after the original install in 2016).

Many thanks to everybody who answered!
Jesper

-- 
Jesper Dybdal
https://www.dybdal.dk

Thread

Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 14:30 +0200
  Re: Am I infected with a rootkit? Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2023-04-16 14:50 +0200
    Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-16 15:20 +0200
      Re: Am I infected with a rootkit? Greg Wooledge <greg@wooledge.org> - 2023-04-16 16:00 +0200
        Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-16 17:20 +0200
    Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 16:10 +0200
    Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-18 15:50 +0200
      Re: Am I infected with a rootkit? David Christensen <dpchrist@holgerdanske.com> - 2023-04-18 21:40 +0200
        Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-19 16:00 +0200
  Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-16 15:00 +0200
    Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 16:10 +0200
      Re: Am I infected with a rootkit? Jeffrey Walton <noloader@gmail.com> - 2023-04-16 16:50 +0200
      Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-16 17:20 +0200
  Re: Am I infected with a rootkit? Greg Wooledge <greg@wooledge.org> - 2023-04-16 15:10 +0200
    Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 16:40 +0200
      Re: Am I infected with a rootkit? Greg Wooledge <greg@wooledge.org> - 2023-04-16 18:00 +0200
        Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 18:50 +0200
          Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-16 19:30 +0200
        Re: Am I infected with a rootkit? "Thomas Schmitt" <scdbackup@gmx.net> - 2023-04-16 19:40 +0200
          Re: Am I infected with a rootkit? David Wright <deblis@lionunicorn.co.uk> - 2023-04-16 20:50 +0200
          Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 22:20 +0200
      Re: Am I infected with a rootkit? Curt <curty@free.fr> - 2023-04-17 18:50 +0200
  Re: Am I infected with a rootkit? Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-04-16 16:40 +0200
    Re: Am I infected with a rootkit? <tomas@tuxteam.de> - 2023-04-16 17:20 +0200
    Re: Am I infected with a rootkit? David Wright <deblis@lionunicorn.co.uk> - 2023-04-18 06:50 +0200
      Re: Am I infected with a rootkit? David <bouncingcats@gmail.com> - 2023-04-18 07:40 +0200
        Re: Am I infected with a rootkit? <tomas@tuxteam.de> - 2023-04-18 10:00 +0200
          Re: Am I infected with a rootkit? debian-user@howorth.org.uk - 2023-04-18 13:00 +0200
            Re: Am I infected with a rootkit? <tomas@tuxteam.de> - 2023-04-18 13:10 +0200
          Re: Am I infected with a rootkit? David <bouncingcats@gmail.com> - 2023-04-18 14:10 +0200
            Re: Am I infected with a rootkit? <tomas@tuxteam.de> - 2023-04-18 14:30 +0200
              Re: Am I infected with a rootkit? songbird <songbird@anthive.com> - 2023-04-18 18:00 +0200
                Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-18 18:30 +0200
                Re: Am I infected with a rootkit? Andy Smith <andy@strugglers.net> - 2023-04-18 20:40 +0200
        Re: Am I infected with a rootkit? Jesper Dybdal <jesper@dybdal.dk> - 2023-04-18 16:00 +0200
  Re: Am I infected with a rootkit? David Wright <deblis@lionunicorn.co.uk> - 2023-04-16 16:40 +0200
  Re: Am I infected with a rootkit? David Christensen <dpchrist@holgerdanske.com> - 2023-04-17 03:20 +0200
    Re: Am I infected with a rootkit? Michel Verdier <mv524@free.fr> - 2023-04-17 17:40 +0200
    Re: Am I infected with a rootkit? Stefan Monnier <monnier@iro.umontreal.ca> - 2023-04-17 19:00 +0200
      Re: Am I infected with a rootkit? Tim Woodall <debianuser@woodall.me.uk> - 2023-04-17 20:30 +0200
  Re: Am I infected with a rootkit? Richmond <dnomhcir@gmx.com> - 2023-04-18 10:40 +0200
    Re: Am I infected with a rootkit? Jesper Dybdal <jesper@dybdal.dk> - 2023-04-18 16:00 +0200
      Re: Am I infected with a rootkit? Jeremy Ardley <jeremy@ardley.org> - 2023-04-18 16:10 +0200
        Re: Am I infected with a rootkit? Charles Curley <charlescurley@charlescurley.com> - 2023-04-18 17:00 +0200

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