alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Alexa Spyware Reporting URL"; flow:established,to_server; content:"/image_server.cgi?size=small&url=http|3a|/"; nocase; http_uri; classtype:pup-activity; sid:2002349; rev:8; metadata:created_at 2010_07_30, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_14;)