This rule detects the execution of the Nmap tool on Linux systems by searching for process events that indicate the start of the Nmap process. Nmap is an open-source tool used for network exploration and security auditing. It can help map networks, identify active services, and detect the operating systems in use. While legitimate security professionals may utilize Nmap for vulnerability assessments and network management, its presence can also indicate potential reconnaissance activities, where an attacker gathers information prior to executing a malicious act. Therefore, monitoring for its execution is critical in detecting potential threats and ensuring the security of the network environment.