alert http1 $EXTERNAL_NET any -> $HOME_NET any (msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle USAToday Server]"; flow:established,to_client; http.response_line; content:"HTTP/1."; startswith; http.header; content:"Connection|3a 20|close"; content:"Content-Type|3a 20|application/json|3b 20|charset=utf-8"; content:"Content-Security-Policy|3a 20|upgrade-insecure-requests"; content:"Strict-Transport-Security|3a 20|max-age=10890000"; content:"Cache-Control|3a 20|public, immutable, max-age=315360000"; content:"Accept-Ranges|3a 20|bytes"; content:"X-Cache|3a 20|HIT, HIT"; content:"X-Timer|3a 20|S1593010188.776402,VS0,VE1"; content:"Vary|3a 20|X-AbVariant, X-AltUrl, Accept-Encoding"; fast_pattern; reference:url,github.com/fireeye/red_team_tool_countermeasures; classtype:trojan-activity; sid:2031274; rev:6; 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 2024_04_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)