alert tcp $EXTERNAL_NET any -> $HOME_NET 513 (msg:"GPL MISC rlogin bin"; flow:to_server,established; content:"bin|00|bin|00|"; reference:arachnids,384; classtype:attempted-user; sid:2100602; rev:6; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)