alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Successful Mailbox Upgrade Phish 2016-06-27 M2"; flow:to_server,established; http.method; content:"POST"; http.uri; content:".php?userid="; http.header; content:".php?userid="; http.request_body; content:"password="; depth:9; nocase; fast_pattern; content:"&submit=upgrade+account"; nocase; distance:0; classtype:credential-theft; sid:2032024; rev:3; metadata:attack_target Client_Endpoint, created_at 2016_06_27, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_07_15, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)