alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Farfli.CUY CnC Server Response"; flow:established,to_client; content:"|68 78 20 10 00 00 00 01 00 00 00 01 00 00 00 11|"; dsize:16; startswith; fast_pattern; stream_size:server,=,17; reference:md5,c99397d66e49e2def1b17f57cd0c5fb9; classtype:command-and-control; sid:2035879; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_08, deployment Perimeter, malware_family Win32_Farfli_CUY, confidence High, signature_severity Major, tag c2, updated_at 2022_04_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)