alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [Fireeye] Backdoor.BEACON M5"; flow:established,from_server; file.data; content:"<meta name=|22|msvalidate.01|22| content=|22|ECEE9516DDABFC7CCBBF1EACC04CAC20|22|>"; content:"<meta name=|22|google-site-verification|22| content=|22|CD5EF1FCB54FE29C838ABCBBE0FA57AE|22|>"; reference:url,www.fireeye.com/blog/threat-research/2020/12/evasive-attacker-leverages-solarwinds-supply-chain-compromises-with-sunburst-backdoor.html; classtype:trojan-activity; sid:2031358; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_14, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2020_12_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)