Cisco IOS Suspicious Privileged Account Creation

This analytic detects the creation of privileged user accounts or the elevation of existing accounts to privilege level 15 (the highest administrative privilege level) on Cisco IOS devices. This activity is suspicious as it could indicate an attacker establishing backdoor access or persistence after gaining initial access, potentially through vulnerabilities like CVE-2018-0171. The rule specifically looks for commands related to setting user privilege to 15, modifying user passwords in conjunction with user table modifications, or explicit privilege updates to level 15.