alert tcp $EXTERNAL_NET any -> $HOME_NET 514 (msg:"GPL MISC rsh echo + +"; flow:to_server,established; content:"echo |22|+ +|22|"; reference:arachnids,388; classtype:attempted-user; sid:2100608; rev:6; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)