alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ReflectiveGnome Download Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".bin"; endswith; http.user_agent; content:"msie"; bsize:4; fast_pattern; http.host.raw; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Accept"; classtype:command-and-control; sid:2034042; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_29, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_29;)