alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE NanoCore RAT Keep-Alive Beacon (Inbound)"; flow:established,to_client; dsize:12; content:"|08 00 00 00 c1 c3 d0 32 43 59 a1 78|"; fast_pattern; reference:md5,c38152f0098b7d0ad4a8de0b7b8df193; reference:url,medium.com/@the_abjuri5t/nanocore-rat-hunting-guide-cb185473c1e0; classtype:command-and-control; sid:2046917; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_30, deployment Perimeter, malware_family NanoCore, confidence High, signature_severity Major, tag c2, updated_at 2023_07_26, former_sid 2841753, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)