alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/FeIQ Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/Upgrade.php"; bsize:12; fast_pattern; http.user_agent; content:!"Mozilla"; content:!"Linux"; http.header_names; content:!"Referer"; reference:md5,d6f8d10fe4e0c10cb5dcb993496a8512; classtype:pup-activity; sid:2046739; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_07_05, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_05; target:src_ip;)