alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE SunSeed Download Retrieving Binary"; flow:established,to_client; flowbits:isset,ETPRO.SunSeed.Downloader; http.response_line; content:"HTTP/1.1 200 OK"; http.header; content:"Content-Disposition|3a 20|attachment|3b 20|filename="; content:".msi|0d 0a|"; distance:0; file.data; content:"http.lua"; fast_pattern; classtype:trojan-activity; sid:2035362; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_02_28, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_20;)