alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING Possible Phishing Landing - Data URI Inline Javascript Mar 07 2016"; flow:established,to_client; http.stat_code; content:"200"; http.content_type; content:"text/html"; startswith; file.data; content:"data|3a|text/html|3b|"; fast_pattern; content:"|3b|base64,"; within:21; pcre:"/^[^\x22|\x27]+<\s*?script(?:(?!<\s*?\/\s*?script).)+?data\x3atext\/html\x3b(?:charset=UTF-8\x3b)?base64\x2c/si"; reference:url,proofpoint.com/us/threat-insight/post/Obfuscation-Techniques-In-Phishing-Attacks; classtype:social-engineering; sid:2022597; rev:5; metadata:attack_target Client_Endpoint, created_at 2016_03_07, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_08_19, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)