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; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; bsize:57; http.header_names; content:!"Referer"; target:src_ip; reference:md5,93419e7818759ebd01e65a84f4c6535d; classtype:trojan-activity; sid:2049263; rev:2; 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_01_31; target:src_ip;)