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I've noticed a lot of weird logs in /var/log on my server.

For example:

cd /var/log/DIST00000001ARGC00000005ARGV00000002ccARGV00000002-cARGV00000006nmap.cARGV00000002-oARGV00000006nmap.oDOTI00000000
sudo cat user.log 
Jun 30 16:48:08 DIST00000001ARGC00000005ARGV00000002ccARGV00000002-cARGV00000006nmap.cARGV00000002-oARGV00000006nmap.oDOTI00000000

Another example:

cd /var/log/Nmap
sudo cat user.log 
Jun 30 16:48:28 Nmap

Note Nmap is not installed on my server.

Another example:

cd get_info
sudo cat user.log
Jun 30 16:48:25 get_info

I'm worried this may be a sign my server has been compromised, but perhaps it's something else?

The server is Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-77-generic x86_64) with unattended-upgrades turned on for security updates.

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Not necessarily a 100% 'answer' but getting to the next step -- maybe strings sent by an nmap service probe?

https://svn.nmap.org/!svn/bc/3320/nmap/nmap-service-probes

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  • Thanks @paal527569 I think you're right. Seems odd the probes are getting their own log files though. I guess there must be something installed on the server which is logging this stuff.
    – Stiofán
    Jul 5 at 16:55
  • @Stiofán do you have anything listening on port 3632?
    – user253751
    Jul 7 at 9:03

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