SysmonForLinux VS sysmon-modular

Did you know that Sysmon is so fantastic that Microsoft ported it to Linux? They sure did and it is awesome. It can be found here: https://github.com/Sysinternals/SysmonForLinux

I followed the install instructions for RHEL 8 found here: https://github.com/Sysinternals/SysmonForLinux/blob/main/INSTALL.md and that seemed to work correctly.

I was specifically using the https://github.com/olafhartong/sysmon-modular config, but once we started seeing systems crash I tried building extremely minimal configs and still found them causing hangs.

I use this one: https://github.com/olafhartong/sysmon-modular

2) There are many opensource solutions, and you hit on all the important ones. Think creativitly, and test all your controls. hit your boxes with Metaspoilt and atomic redteam. These tools will help you verify that you have the proper controls in place, and that you are able to detect attacks (successful, and failed). Run auditd with Florian Roth's rule set on your linux boxes (https://github.com/Neo23x0/auditd/blob/master/audit.rules ), and sysmon (https://github.com/olafhartong/sysmon-modular) on windows.

Agree. Harden your endpoints (if unsure where to start consider hardening kitty, https://github.com/scipag/HardeningKitty) and harden Defender (https://0ut3r.space/2022/03/06/windows-defender/). Add Sysmon with a good config (https://github.com/olafhartong/sysmon-modular) and you've reached a good starting point.

Another really excellent resource (also called out by Swift) is Olaf Hartong’s Sysmon-Modular project: https://github.com/olafhartong/sysmon-modular As well as having a few full configs, Olaf’s project has modular XML configurations for each supported Sysmon Event ID. This can be incredibly helpful for fine tuning your configs.

Yes absolutely. This is a very common workflow for both. One note is that you need to also find a sysmon config to use as well, and there's no easy way to manage either sysmon or its config through Splunk. Recommendations for a config are either SwiftOnSecurity's or Olaf's SysmonModular. They significantly overlap and work with each other on patches. SwiftOnSecurity's is a better pure drop-in, and Olaf's is better if you want to do customization.

For some of the items you mentioned having a good sysmon config would help too. https://github.com/SwiftOnSecurity/sysmon-config or https://github.com/olafhartong/sysmon-modular are good starting points