Find sigma rule 
Attack: Create Account: Local Account
Adversaries may create a local account to maintain access to victim systems. Local accounts are those configured by an organization for use by users, remote support, services, or for administration on a single system or service.
For example, with a sufficient level of access, the Windows net user /add command can be used to create a local account. On macOS systems the dscl -create command can be used to create a local account. Local accounts may also be added to network devices, often via common Network Device CLI commands such as username, or to Kubernetes clusters using the kubectl utility.(Citation: cisco_username_cmd)(Citation: Kubernetes Service Accounts Security)
Such accounts may be used to establish secondary credentialed access that do not require persistent remote access tools to be deployed on the system.
MITRE
Tactic
- persistence
technique
- T1136.001
Test : Create a user account on a Linux system
OS
- linux
Description:
Create a user via useradd
Executor
bash