alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Farfli.CUY KeepAlive M1"; dsize:16; flow:established,to_server; stream_size:client,>,200; content:"|68 78 20 10 00 00 00 01 00 00 00 01 00 00 00 c9|"; reference:md5,0428de20539f8341f0987457bc96fd9f; reference:md5,57e582c2a00cfb50a748b78b6c17ee74; classtype:command-and-control; sid:2035632; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_11_16, deployment Perimeter, malware_family Win32_Farfli_CUY, confidence High, signature_severity Major, updated_at 2021_11_16, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)