alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ATTACK_RESPONSE Crpx0 Ransomware Payload Inbound (Launcher)"; flow:established,to_client; http.response_body; content:"|3a|FETCH|5f|PAYLOAD"; fast_pattern; content:"|3a 3a 20|3|2e 20|Download|20|Installer"; content:"|3a 3a 20|We|20|pass|20|the|20|AGENT|5f|ID"; classtype:trojan-activity; sid:2068539; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_02, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_04_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:dest_ip;)