alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL DELETED TFN Probe"; icmp_id:678; itype:8; content:"1234"; reference:arachnids,443; classtype:attempted-recon; sid:2100221; rev:5; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)