ET MALWARE [Fireeye] Backdoor.BEACON M4

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE [Fireeye] Backdoor.BEACON M4";
    flow:established,from_server;
    file.data;
    content:"<p>Companies-Best-Man-Vendors-Best</p>";
    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:2031357; 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;
)