alert smb $HOME_NET any -> any any (msg:"ET EXPLOIT Possible DOUBLEPULSAR Beacon Response"; flow:from_server,established; content:"|00 00 00 23 ff|SMB2|02 00 00 c0 98 07 c0 00 00|"; depth:18; content:"|00 00 00 08 ff fe 00 08|"; distance:8; within:8; fast_pattern; pcre:"/^[\x50-\x59]/R"; content:"|00 00 00|"; distance:1; within:3; endswith; classtype:trojan-activity; sid:2024216; rev:2; metadata:attack_target Client_Endpoint, created_at 2017_04_17, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag c2, updated_at 2019_09_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)