alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING Base64 Data URI Javascript Refresh - Possible Phishing Landing"; flow:from_server,established; file_data; content:"<script"; nocase; content:"window.location="; distance:0; content:"data|3a|text/html|3b|base64,"; distance:1; within:22; fast_pattern; classtype:social-engineering; sid:2031955; rev:3; metadata:attack_target Client_Endpoint, created_at 2016_07_15, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2019_07_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)