This rule detects the creation of a new user with administrative privileges on Linux systems. Specifically, it identifies when a user is added to privileged groups, such as 'root' or 'sudo'. For detection to occur, logs from either '/var/log/secure' on RHEL systems or '/var/log/auth.log' on Debian-like systems must be collected. It scrutinizes the addition of new users with specific User IDs (UID) or Group IDs (GID) indicative of privileged access, where GID=0 corresponds to root access, and GID=10 and GID=27 might represent other privileged groups. This detection is crucial for early warnings against unauthorized privilege escalations which can lead to security breaches.