alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle CDN GET]"; flow:established,to_server; http.method; content:"GET"; http.accept; content:"*/*"; depth:3; http.accept_enc; content:"gzip, deflate, br"; depth:17; http.accept_lang; content:"en-US"; bsize:5; http.header; content:"client-="; fast_pattern; content:"|3b|auth=1}"; http.uri; pcre:"/^\/v1\/(?:queue|profile|docs\/wsdl|pull)/"; reference:url,github.com/fireeye/red_team_tool_countermeasures; classtype:trojan-activity; sid:2031282; 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;)