alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Tech Support Phone Scam Landing 2017-07-26"; flow:from_server,established; file_data; content:"<title>Windows Defender"; nocase; fast_pattern; content:"<audio id=|22|play|22 20|loop="; nocase; distance:0; content:".mp3|22 20|type=|22|audio/mpeg"; nocase; distance:0; content:"Windows Defender Alert"; nocase; distance:0; classtype:social-engineering; sid:2025910; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_07_26, deployment Perimeter, confidence High, signature_severity Minor, tag Tech_Support_Scam, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_16;)