alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SunSeed Downloader Retrieving Binary (set)"; flow:established,to_server; flowbits:set,ETPRO.SunSeed.Downloader; flowbits:noalert; http.request_line; content:"GET / HTTP/1.1"; http.user_agent; content:"Windows Installer"; bsize:17; fast_pattern; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; classtype:trojan-activity; sid:2035361; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_28, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_18, reviewed_at 2023_08_25;)