alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Qakbot.Bot Version 8 CnC Beacon"; flow:established,to_server; urilen:7<>32; content:"|0d 0a 0d 0a|v="; fast_pattern; http.method; content:"POST"; http.uri; content:".php"; endswith; pcre:"/^\/[b-u][A-Za-z0-9]{6,25}\.php$/"; http.header_names; content:!"Referer|0d 0a|"; http.request_body; content:"&c="; reference:url,www.anubisnetworks.com/the-return-of-qakbot/; reference:md5,e9201c8b126ac40229e9ce3f82f5c608; reference:md5,749a7bf2ad84212bd78e46d240a4f434; classtype:command-and-control; sid:2018204; rev:4; metadata:attack_target Client_Endpoint, created_at 2014_03_04, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_04_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)