alert tcp $HOME_NET 23 -> $EXTERNAL_NET any (msg:"GPL TELNET Bad Login"; flow:from_server,established; content:"Login incorrect"; nocase; fast_pattern; classtype:bad-unknown; sid:2101251; rev:10; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)