PROTOCOL-ICMP -- Snort alerted on Internet Control Message Protocol (ICMP) traffic, which allows hosts to send error messages about interruptions in traffic. Administrators can use ICMP to perform diagnostics and troubleshooting, but the protocol can also be used by attackers to gain information on a network. This protocol is vulnerable to several attacks, and many administrators block it altogether, or block selective messages.
PROTOCOL-ICMP Unusual PING detected
The rule looks for PING traffic coming into the network that doesn't follow the normal format of a PING.
What To Look For
This rule will trigger when anomalous PING traffic is seen.
No public information
No known false positives
Cisco Talos Intelligence Group