alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP W32/RocketfuelNextUp.Adware CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/evt/?nexcb="; startswith; fast_pattern; pcre:"/^\x2Fevt\x2F\x3Fnexcb\x3D[a-f0-9\x2D]{10,}$/"; http.request_body; content:"a="; depth:2; content:"&b="; distance:0; http.header_names; content:!"User-Agent|0d 0a|"; reference:md5,408e8969cd0abd153eab6696f8add363; classtype:pup-activity; sid:2018565; rev:6; metadata:attack_target Client_Endpoint, created_at 2014_06_16, deployment Perimeter, signature_severity Minor, tag c2, updated_at 2020_10_12, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)