alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL SCAN XMAS"; flow:stateless; flags:SRAFPU,12; reference:arachnids,144; classtype:attempted-recon; sid:2100625; rev:8; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)