alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TrochilusRAT CnC Beacon 1"; flow:established,to_server; dsize:8; content:"|bf bf af af 7e 00 00 00|"; fast_pattern; threshold:type limit, count 1, seconds 60, track by_src; reference:url,asert.arbornetworks.com/wp-content/uploads/2016/01/ASERT-Threat-Intelligence-Brief-Uncovering-the-Seven-Pointed-Dagger.pdf; classtype:command-and-control; sid:2022360; rev:4; metadata:attack_target Client_Endpoint, created_at 2016_01_13, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2019_10_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)