alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING Successful Mailbox Upgrade Phish 2016-06-27 M1"; flow:to_client,established; http.stat_code; content:"200"; http.content_type; content:"text/html"; startswith; file.data; content:"<title>Mail Upgrade"; nocase; fast_pattern; content:"form class=|22|form-signin"; nocase; distance:0; content:"Please wait"; nocase; distance:0; content:"id=|22|success"; nocase; distance:0; content:"Email account upgraded"; nocase; distance:0; classtype:credential-theft; sid:2032023; 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;)