Detecting Network Scanning with IDS Signatures Overview Network scanning is typically the first phase of an attack, where adversaries enumerate live hosts, open ports, running services, and OS versions using tools like Nmap, Masscan, ZMap, and custom scanners. Detecting this reconnaissance activity provides early warning of potential attacks. IDS/IPS systems like Suricata and Snort can identify scanning through signature-based detection (matching known scanner packet patterns), threshold-based detection (counting connection attempts over time), and anomaly detection (identifying unusual traff…