alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Tech Support Phone Scam Landing 2018-01-10"; flow:from_server,established; file_data; content:"<title>Security Warning"; nocase; fast_pattern; content:"background-color:#d70000"; nocase; distance:0; classtype:social-engineering; sid:2025197; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_01_10, deployment Perimeter, confidence High, signature_severity Minor, tag Tech_Support_Scam, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_16;)