alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Waledac Beacon Traffic Detected"; flow:to_server,established; http.method; content:"POST"; depth:4; http.user_agent; content:"Mozilla"; bsize:7; http.request_body; content:"a="; nocase; http.referer; content:"Mozilla"; nocase; bsize:7; reference:url,www.shadowserver.org/wiki/pmwiki.php?n=Calendar.20081231; classtype:trojan-activity; sid:2008958; rev:7; metadata:attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)