alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP W32/iBryte.Adware Installer Download"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".exe?mode="; content:"&sf="; content:"&browser="; content:"&useragent="; http.header_names; content:!"Referer"; reference:md5,4c80e5f72a2ab8324b981e37b3b0e5d1; classtype:pup-activity; sid:2020197; rev:7; metadata:created_at 2015_01_16, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_31;)