The rule 'FortiGate - User Group Modified' is designed to detect modifications made to user groups on Fortinet's FortiGate Firewall. Such modifications could be indicative of unauthorized changes, which might impact network security, particularly in regards to VPN access. This rule specifically targets the log events generated by FortiGate firewalls when user groups are altered. The condition for detection is set to capture any 'Edit' actions in the user group configuration path. Due to the potential for legitimate administrative changes, this rule acknowledges that false positives may occur, such as during routine updates or modifications that are necessary for organizational operations. Therefore, it emphasizes the importance of context in analyzing the alerts generated by this detection rule. It is categorized under persistence and privilege escalation tactics, reflecting its relevance in the broader context of cybersecurity threats and monitoring efforts.