alert http1 $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE APT Lurker POST CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.header_names; content:!"Content-Type|0d 0a|"; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|HOST|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a 0d 0a|"; fast_pattern; reference:md5,c5a8e09295b852a6e32186374b66e1a7; reference:url,blogs.rsa.com/wp-content/uploads/2015/05/RSA-IR-Case-Study.pdf; classtype:targeted-activity; sid:2021584; rev:9; metadata:attack_target Client_Endpoint, created_at 2015_08_03, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_06, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)