alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Havoc Demon CnC Request"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"|DE AD BE EF|"; offset:4; fast_pattern; content:"|00 00 00 63|"; distance:4; within:4; byte_jump:4,0, post_offset -1; isdataat:!2,relative; reference:url,zscaler.com/blogs/security-research/havoc-across-cyberspace; reference:url,fortinet.com/blog/threat-research/malware-disguised-as-document-ukraine-energoatom-delivers-havoc-demon-backdoor; classtype:command-and-control; sid:2056539; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_10_07, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2024_10_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)