alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ATTACK_RESPONSE 123Stealer Payload Inbound"; flow:established,to_client; http.response_body; content:"const|20|isWin|20 3d 20|os|2e|platform|28 29 20 3d 3d 3d 20 27|win32|27 3b|"; content:"For|20|Linux|20 2d 20|use|20|script|20|directory|20 28|same|20|as|20|payload|2e|js|29|"; fast_pattern; threshold:type limit,count 1,seconds 300,track by_dst; reference:md5,544be46f232f0cacecf73cc1be65ce62; classtype:trojan-activity; sid:2066689; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_12, deployment Perimeter, deployment SSLDecrypt, malware_family 123Stealer, confidence Medium, signature_severity Major, updated_at 2026_01_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:dest_ip;)