alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[Yelp Request]"; flow:established,to_server; http.cookie; content:"hl=en|3b|bse="; startswith; fast_pattern; pcre:"/^(?:[a-zA-Z0-9+\/]{4})*(?:[a-zA-Z0-9_\/\+\-]{2}==|[a-zA-Z0-9_\/\+\-]{3}=|[a-zA-Z0-9_\/\+\-]{4})\x3b/"; content:"|3b|_gat_global=1|3b|recent_locations|3b|_gat_www=1|3b|"; endswith; reference:url,github.com/fireeye/red_team_tool_countermeasures; classtype:trojan-activity; sid:2031289; 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 High, 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;)