alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP PUA Boxore User-Agent"; flow:to_server,established; http.user_agent; content:"BoxoreClent"; depth:11; http.header_names; content:!"Referer|0d 0a|"; reference:md5,5cb2e8a9b6935f228623c69f1b17669d; classtype:pup-activity; sid:2021700; rev:5; metadata:created_at 2015_08_21, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_31;)