alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/SpyClicker.ClickFraud CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/feed.dll?pub_id="; fast_pattern; content:"&ua="; offset:17; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,stopmalvertising.com/malware-reports/anatomy-of-a-net-click-fraud-bot.html; reference:md5,17b077840ab874a8370c98c840b6c671; classtype:command-and-control; sid:2019355; rev:5; metadata:attack_target Client_Endpoint, created_at 2014_10_06, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_25, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)