alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Malicious Loader Related Activity (GET)"; flow:established,to_server; flowbits:set,ET.misc.loader; flowbits:noalert; http.method; content:"GET"; http.uri; content:".html"; endswith; http.user_agent; content:"|3b 20|WinHttp.WinHttpRequest.5|29|"; fast_pattern; http.header_names; content:!"Referer"; reference:md5,e788e3c27518515d09b5dee9f60acb49; classtype:trojan-activity; sid:2049799; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_20, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_20; target:src_ip;)