Detection Logic
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[YUBIKEY] Invalid OTP"; program: yk_chkpwd; content: "password check failed for user"; after: track by_src, count 5, seconds 300; threshold: type suppress, track by_src, count 5, seconds 300; default_proto: tcp; classtype: unsuccessful-user; sid:5002735; rev:3; metadata: mitre_technique_id T1078, mitre_technique_id T1110;)Field Validations
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