ET INFO Microsoft Dev Tunnels Domain (tunnels .api .visualstudio .com) in TLS SNI

Query · suricata

flow:established,to_server;
tls.sni; dotprefix;
content:".tunnels.api.visualstudio.com"; endswith; fast_pattern;
Raw source ET INFO Microsoft Dev Tunnels Domain (tunnels .api .visualstudio .com) in TLS SNI · Suricata
Esc
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 Microsoft Dev Tunnels Domain (tunnels .api .visualstudio .com) in TLS SNI";
    flow:established,to_server;
    tls.sni; dotprefix;
    content:".tunnels.api.visualstudio.com"; endswith; fast_pattern;
    reference:url,ipfyx.fr/post/visual-studio-code-tunnel/#web-traffic-monitoring;
    reference:url,github.com/SigmaHQ/sigma/blob/master/rules/windows/dns_query/dns_query_win_vscode_tunnel_communication.yml;
    classtype:misc-activity;
    sid:2063120; rev:1;
    metadata:affected_product Any, attack_target Client_and_Server, created_at 2025_06_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_06_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1665, mitre_technique_name Hide_Infrastructure;
)

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