alert tcp $EXTERNAL_NET any -> $HOME_NET 513 (msg:"GPL MISC rlogin echo++"; flow:to_server,established; content:"echo |22| + + |22|"; reference:arachnids,385; classtype:bad-unknown; sid:2100603; rev:6; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)