alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP BTGrab.com Spyware Downloading Ads"; flow:established,to_server; http.uri; content:"/a/Drk.syn?"; fast_pattern; nocase; content:"adcontext="; nocase; reference:url,www.btgrab.com; reference:url,www3.ca.com/securityadvisor/pest/pest.aspx?id=453090726; classtype:pup-activity; sid:2001999; rev:11; metadata:created_at 2010_07_30, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_15;)