Re: What is the best free HIDS for Debian

Dear Sylvain

Am 04.05.22 um 13:17 schrieb Sylvain:
> I've just tried debcheckroot too. It throws error. I'll try to fix them.

Am 06.05.22 um 15:05 schrieb Sylvain Sécherre:
 > Here's the fileserror.lis:
 > ..._.GM /usr/bin/crontab cron_3.0pl1-137_amd64 root root 755
 > ..._..M /usr/bin/pkexec policykit-1_0.105-31+deb11u1_amd64 root root 755
 > ..._.GM /usr/bin/ssh-agent openssh-client_1:8.4p1-5_amd64 root root 755
 > ...

   I hope you won´t mind that I am citing the output of debcheckroot you 
have given me.
   These three files point to an infection with a rootkit. Don´t care 
about modified configuration files like in /etc too much (but you may 
still have a look at them). Executable files on the other hand must 
never be modified. If these three files are different it means that 
someone has altered your system. If you look at the man pages of these 
executables then you also know that a maker of a rootkit would have 
interest to modify exactly these files.

 > The file filesunverified.lis is very long, while pkgcorrupt.lis is empty.

   If you have updated your system some time ago and there are newer 
versions on the update server now then debcheckroot can certainly not 
find these packages any more. You could try to update your system and 
then verify again. Normally the rootkit will persist. However connecting 
your computer to a network may be detrimental since the rootkit owner 
may simply uninstall his rootkit once he knows that his malware has been 
discovered.
   I would at least save suspicious executables first and additionally 
the packages with known good of the same version.

Regards,
Elmar