alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SearchLoader CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"|2f|search|2f 3f|text|3d|"; fast_pattern; startswith; pcre:"/^(?:[a-zA-Z0-9]){30}$/R"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache|2d|Control|0d 0a 0d 0a|"; threshold:type limit,count 5,seconds 300,track by_src; classtype:trojan-activity; sid:2065564; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_29, deployment Perimeter, confidence High, signature_severity Major, tag SearchLoader, updated_at 2025_10_29;)