alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL SCAN adm scan"; flow:to_server,established; content:"PASS ddd@|0A|"; reference:arachnids,332; classtype:suspicious-login; sid:2100353; rev:7; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)