alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Ads2Srv Bundle Installer Offer Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/bundles.php?cat="; startswith; fast_pattern; content:"&zone="; distance:0; content:"&pid="; http.user_agent; bsize:20; content:"NSISDL/1.2 (Mozilla)"; reference:md5,6ac226609b33b32aa1e1adebb5cfefc0; classtype:pup-activity; sid:2029543; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_27, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_27;)