alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Specula Framework CnC Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"Specula"; fast_pattern; reference:url,trustedsec.com/blog/specula-turning-outlook-into-a-c2-with-one-registry-change; reference:url,github.com/trustedsec/specula/blob/a42059ba776c1242b917a5243af613fe5c75f624/lib/handlers/validation.html#L58; classtype:trojan-activity; sid:2054781; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_07_30, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2024_07_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)