alert udp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN Amap UDP Service Scan Detected"; dsize:<135; content:"THCTHCTHCTHCTHC|20 20 20|"; reference:url,freeworld.thc.org/thc-amap/; classtype:attempted-recon; sid:2010372; rev:2; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)