alert http $HOME_NET any -> $EXTERNAL_NET 6101 (msg:"ET MALWARE Suspected Trojan-Proxy Web Socket Connection Activity"; flow:established,to_server; urilen:6; http.method; content:"GET"; http.uri; content:"/strvn"; fast_pattern; http.header; content:"|0d 0a|Upgrade|3a 20|websocket|0d 0a|"; http.header_names; content:"|0d 0a|Sec-WebSocket-Version|0d 0a|Sec-WebSocket-Key|0d 0a 0d 0a|"; endswith; reference:md5,063d956b55da0d18f3f732c2bbd4bc28; reference:url,securelist.com/trojan-proxy-for-macos/111325/; classtype:trojan-activity; sid:2051982; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_10, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_10; target:src_ip;)