ET INFO Observed RMM Domain in TLS SNI (a1-backend-packages-* .s3 .amazonaws .com)

Query · suricata

flow:established,to_server;
tls.sni; dotprefix;
content:"a1-backend-packages"; fast_pattern;
content:".s3.amazonaws.com"; endswith; distance:0;
Raw source ET INFO Observed RMM Domain in TLS SNI (a1-backend-packages-* .s3 .amazonaws .com) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Observed RMM Domain in TLS SNI (a1-backend-packages-* .s3 .amazonaws .com)";
    flow:established,to_server;
    tls.sni; dotprefix;
    content:"a1-backend-packages"; fast_pattern;
    content:".s3.amazonaws.com"; endswith; distance:0;
    reference:url,attack.mitre.org/techniques/T1219/;
    reference:url,action1.com/documentation/firewall-configuration/;
    classtype:misc-activity;
    sid:2063878; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, affected_product Windows_8, affected_product Windows_10, affected_product Action1, attack_target Client_and_Server, created_at 2025_08_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag RAT, tag RemoteAccessTool, updated_at 2025_08_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;
)

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