alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/YTDDownloader.F Activity"; flow:established,to_server; http.request_line; content:"GET /offers/offers.php?id="; startswith; fast_pattern; content:" HTTP/1.0"; endswith; http.user_agent; bsize:20; content:"NSISDL/1.2 (Mozilla)"; reference:md5,a53b0c85d4e65e06c59e854b84ad7f17; classtype:pup-activity; sid:2029470; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_14, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_14;)