alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Kbot.Backdoor Variant CnC Beacon"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; content:"/stat.php"; nocase; http.request_body; content:"id="; depth:3; content:"&build_id="; fast_pattern; pcre:"/&build_id=[A-F0-9]+$/i"; reference:md5,1df0ceab582ae94c83d7d2c79389e178; classtype:command-and-control; sid:2018078; rev:5; metadata:attack_target Client_Endpoint, created_at 2014_02_05, 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;)