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Groups > linux.debian.security > #5834

Re: rkhunter finds something suspicious

From Elmar Stellnberger <estellnb@elstel.org>
Newsgroups linux.debian.security
Subject Re: rkhunter finds something suspicious
Date 2020-05-08 16:00 +0200
Message-ID <A4bHI-3MY-11@gated-at.bofh.it> (permalink)
References <A3SlH-sU-1@gated-at.bofh.it> <A493b-2nt-7@gated-at.bofh.it> <A4asi-36V-13@gated-at.bofh.it>
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   You should execute the commands below when you install a new system. 
Closing unnecessary ports makes your system less susceptible to 
cracking, rootkit infection and/or malware infection.

Am 08.05.20 um 14:33 schrieb Elmar Stellnberger:
>   I always use
>  > netstat -atupn
> That shows all open tcp and udp ports. Invoke this before you start 
> Firefox. The list should be empty or only contain sockets on the 
> loopback network interface (127.0.0.*, ::1). To disable unnecessary 
> network daemons use:
>  > systemctl disable avahi-daemon/other-daemon
>  > systemctl stop avahi-daemon
> 
>    For init opening RPC sockets you may need:
>  > systemctl disable rpcbind.socket
>  > systemctl stop rpcbind.socket
> 
>   You may also uninstall unnecessary software:
>  > apt-get remove kdeconnect
> 
> View all processes with
>  > ps ax
> That may also be of help:
>  > pstree -p
> 
> To identify the executable of a process
>  > ls -l /proc/1234/exe
> 
> And to identify the package an executable belongs to:
>  > dpkg -S /bin/bash
> 
> If rkhunter should once not yield the desired results then use 
> debcheckroot: https://www.elstel.org/debcheckroot/
> 
> Also helpful:
>  > systemctl -t service -a
> 
> If you have a rootkit that does f.i. infect system libraries like glibc 
> you will not see anything in the netstat nor in the ps ax output because 
> these utilities can be replaced by utilities that do not return things 
> belonging to the rootkit. To be sure that your system is clean you will 
> need to use debcheckroot as rkhunter only knows a certain set of well 
> known rootkits. However in this case rkhunter may have found something 
> though.
> 
> 
> Am 08.05.20 um 13:08 schrieb shirish शिरीष:
>>
>> Anyways, I don't really know much about netstat hence used ss which is
>> a utility to investigate sockets. Fortunately the version of iproute2
>> has version 5.6.0-1 which gives the option of doing something like -
>>
>> # ss -p
>>
> 

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Thread

rkhunter finds something suspicious shirish शिरीष <shirishag75@gmail.com> - 2020-05-07 19:20 +0200
  Re: rkhunter finds something suspicious Przemek Jagielski <przemek@jagielski.ovh> - 2020-05-07 19:30 +0200
  Re: rkhunter finds something suspicious shirish शिरीष <shirishag75@gmail.com> - 2020-05-08 13:10 +0200
    Re: rkhunter finds something suspicious Elmar Stellnberger <estellnb@elstel.org> - 2020-05-08 14:40 +0200
      Re: rkhunter finds something suspicious Elmar Stellnberger <estellnb@elstel.org> - 2020-05-08 16:00 +0200
  Re: rkhunter finds something suspicious Elmar Stellnberger <estellnb@elstel.org> - 2020-05-08 15:50 +0200
    Re: rkhunter finds something suspicious Elmar Stellnberger <estellnb@elstel.org> - 2020-05-08 16:00 +0200

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