alert tcp any any -> $EXTERNAL_NET any (msg:"🐾 - 🚨 NJRAT 🪟 establishing connection to C2"; flow:to_server, stateless; dsize:<300; content:"|00 6c 6c|"; content:"|7c 27 7c 27 7c 7c 27 7c 27 7c 57 69 6e|"; fast_pattern; content:"|7c 27 7c 27 7c|"; endswith; 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_28, updated_at 2024_02_28; sid:3301151; rev:2; classtype:command-and-control;)