alert ftp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE LucidRook FTP C2 Activity (Download Payload)"; flow:established,to_server; content:"USER"; content:"PASS"; distance:0; content:"PASV"; distance:0; content:"RETR archive1.zip"; distance:0; fast_pattern; reference:url,blog.talosintelligence.com/new-lua-based-malware-lucidrook/; classtype:command-and-control; sid:2068694; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, affected_product Windows_8, affected_product Windows_10, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_04_09, deployment Perimeter, confidence High, signature_severity Major, tag c2, tag LucidRook, updated_at 2026_04_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)