alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE SainboxRAT CnC Config Inbound"; flow:established,to_client; flowbits:isset,ET.sainbox.config; http.response_body; bsize:27; pcre:"/^(?:[a-z0-9]{10})/"; content:".localto.net:"; within:13; fast_pattern; pcre:"/^\d{4}$/R"; classtype:command-and-control; sid:2069283; 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_05_14, deployment Perimeter, deployment SSLDecrypt, malware_family Sainbox, confidence High, signature_severity Critical, tag c2, updated_at 2026_05_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:dest_ip;)