alert tcp any any -> $EXTERNAL_NET any (msg:"🐾 - 🚨 NJRAT 🪟 communication to C2"; flow:to_server, stateless; content:"|00 73 63 50 4b 7c 27 7c 27 7c|"; content:"|7c 27 7c 27 7c ff d8 ff e0 00 10 4a 46 49 46 00 01 01 01 00 60 00 60 00 00 ff db 00 43 00 10 0b 0c 0e 0c 0a 10 0e 0d 0e 12 11 10 13 18 28|"; fast_pattern; reference:url,https://malpedia.caad.fkie.fraunhofer.de/details/win.njrat; target:src_ip; metadata:attack_target Client_and_Server, signature_severity Major, affected_product Windows_XP_Vista_7_8_10_11_Server_32_64_Bit, mitre_tactic_id TA0011, mitre_tactic_name Command_and_Control, mitre_technique_id T1071.001, mitre_technique_name Application_Layer_Protocol_Web_Protocols, former_category MALWARE, malware_family Njrat, created_at 2024_02_26, updated_at 2024_02_26; sid:3301150; rev:1; classtype:command-and-control;)