alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP LocalNRD Spyware Checkin"; flow:to_server,established; content:"/a/Drk.syn?"; nocase; http_uri; content:"adcontext"; nocase; http_uri; reference:url,www.localnrd.com; classtype:pup-activity; sid:2001340; rev:12; metadata:created_at 2010_07_30, signature_severity Minor, updated_at 2019_08_14;)