alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Suspicious HTTP Refresh to SMS Aug 16 2016"; flow:established,from_server; http.stat_code; content:"200"; http.content_type; content:"text/html"; startswith; file.data; content:"<meta http-equiv="; nocase; content:"refresh"; distance:1; within:8; pcre:"/^[^>]+url=sms\x3a/Rsi"; content:"url=sms|3a|"; nocase; fast_pattern; classtype:social-engineering; sid:2023068; rev:4; metadata:attack_target Client_Endpoint, created_at 2016_08_16, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Phishing, updated_at 2020_10_06;)