alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle MSOffice Server]"; flow:from_server,established; http.response_line; content:"HTTP/1."; depth:7; file.data; content:"|7b 22|meta|22 3a 7b 7d 2c 22|status|22 3a 22|OK|22 2c 22|saved|22 3a 22|1|22 2c 22|starttime|22 3a|17656184060|2c 22|id|22 3a 22 22 2c 22|vims|22 3a 7b 22|dtc|22 3a 22|"; fast_pattern; reference:url,github.com/fireeye/red_team_tool_countermeasures; classtype:trojan-activity; sid:2031279; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_08, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2020_12_09, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)