alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/InstallCore.GF CnC Activity"; flow:established,to_server; http.request_line; content:"GET /installer/configs/"; startswith; fast_pattern; content:" HTTP/1.0"; endswith; http.user_agent; bsize:20; content:"NSISDL/1.2 (Mozilla)"; reference:md5,37cbc5d7eaa9ce6a097950aa051080b5; classtype:pup-activity; sid:2030798; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_08_26, deployment Perimeter, malware_family InstallCore, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_26;)