alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Waledac Beacon Traffic Detected"; flow:established,to_server; http.method; content:"POST"; startswith; http.user_agent; bsize:7; content:"Mozilla"; http.request_body; content:"a="; nocase; http.referer; bsize:7; content:"Mozilla"; fast_pattern; nocase; reference:url,www.shadowserver.org/wiki/pmwiki.php?n=Calendar.20081231; classtype:trojan-activity; sid:2008958; rev:10; metadata:attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)