alert http any any -> $HOME_NET any (msg:"ET SCAN NETWORK Incoming Masscan detected"; flow:established,to_server; http.user_agent; content:"masscan/"; startswith; reference:url,blog.erratasec.com/2013/10/that-dlink-bug-masscan.html; reference:url,blog.erratasec.com/2013/09/masscan-entire-internet-in-3-minutes.html; classtype:network-scan; sid:2017616; rev:7; metadata:created_at 2013_10_18, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_12;)