ET MALWARE Downloader.Win32.Small CnC Beacon

Query · suricata

flow:established,to_server;
http.method;
content:"GET"; nocase;
http.user_agent;
content:"MSDN SurfBear"; depth:13; endswith;
Raw source ET MALWARE Downloader.Win32.Small CnC Beacon · 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 http $HOME_NET any -> $EXTERNAL_NET 81:65535 (
    msg:"ET MALWARE Downloader.Win32.Small CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET"; nocase;
    http.user_agent;
    content:"MSDN SurfBear"; depth:13; endswith;
    classtype:command-and-control;
    sid:2011269; rev:8;
    metadata:attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_13, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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