alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Malicious JS Loader Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[a-z]{8,12}$/"; http.user_agent; bsize:57; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,93419e7818759ebd01e65a84f4c6535d; classtype:trojan-activity; sid:2049263; rev:4; metadata:attack_target Client_Endpoint, created_at 2023_11_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30; target:src_ip;)