alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FRAT Downloader Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/myO?gId="; startswith; fast_pattern; http.header_names; content:"Host|0d 0a|Connection|0d 0a 0d 0a|"; content:!"Referer"; content:!"User-Agent"; content:!"Accept-"; reference:md5,f1638d4cd6286b69cb29d8002478d0c1; classtype:trojan-activity; sid:2030494; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_07_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_09;)