alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ATTACK_RESPONSE InstallFix MacOS Payload Inbound"; flow:established,to_client; http.response_body; content:"|23 21 2f|bin|2f|zsh"; depth:15; content:"|3c 3c 27|PAYLOAD|5f|END|27|"; fast_pattern; reference:url,pushsecurity.com/blog/installfix; reference:url,x.com/anyrun_app/status/2036799880392265928; classtype:trojan-activity; sid:2068435; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_03_25, deployment Perimeter, deployment SSLDecrypt, malware_family installfix, confidence Medium, signature_severity Major, updated_at 2026_03_25, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:dest_ip;)