alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Zacom.A CnC Beacon 2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".asp"; fast_pattern; pcre:"/\.asp$/"; http.header; content:"Windows NT 5.0|3b|"; http.request_body; pcre:"/^\d{4}/"; http.header_names; content:!"Content-Type|0d 0a|"; content:!"Referer|0d 0a|"; reference:md5,25631f5ccec8f155a8760b8568ca22c5; classtype:command-and-control; sid:2021214; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_06_09, deployment Perimeter, malware_family Win32_Zacom_A, signature_severity Major, tag c2, updated_at 2020_10_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)