Find sigma rule 
Attack: Process Discovery
Adversaries may attempt to get information about running processes on a system. Information obtained could be used to gain an understanding of common software/applications running on systems within the network. Administrator or otherwise elevated access may provide better process details. Adversaries may use the information from Process Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
In Windows environments, adversaries could obtain details on running processes using the Tasklist utility via cmd or Get-Process via PowerShell. Information about processes can also be extracted from the output of Native API calls such as CreateToolhelp32Snapshot. In Mac and Linux, this is accomplished with the ps command. Adversaries may also opt to enumerate processes via /proc.
On network devices, Network Device CLI commands such as show processes can be used to display current running processes.(Citation: US-CERT-TA18-106A)(Citation: show_processes_cisco_cmd)
MITRE
Tactic
- discovery
technique
- T1057
Test : Process Discovery - ps
OS
- linux
- macos
Description:
Utilize ps to identify processes.
Upon successful execution, sh will execute ps and output to /tmp/loot.txt.
Executor
sh