alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP VilnyNet VPN Install Started"; flow:established,to_server; http.uri; content:"?event=winInstaller"; fast_pattern; content:"&uuid="; distance:0; content:"&osver"; distance:0; content:"&osbuild="; distance:0; http.user_agent; content:"NSISDL/1.2 (Mozilla)"; bsize:20; reference:md5,3bdc372644285aa7b3c8263d7d1c9a4a; classtype:pup-activity; sid:2031533; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_01_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_08;)