alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Malicious Loader Related Activity Response"; flow:established,to_client; flowbits:isset,ET.misc.loader; http.stat_code; content:"200"; file.data; content:"http|3a 2f 2f|"; startswith; fast_pattern; content:".msi"; endswith; reference:md5,e788e3c27518515d09b5dee9f60acb49; classtype:trojan-activity; sid:2049800; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_20, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_20; target:dest_ip;)