ET MALWARE W32/LetsGo.APT Sleep CnC Beacon

Query · suricata

flow:established,to_server;
http.uri;
pcre:"/\.html\?[0-9]{10}$/";
http.user_agent;
content:"sleep|20|"; fast_pattern; startswith;
pcre:"/^sleep \d+[\r\x2c]/";
Raw source ET MALWARE W32/LetsGo.APT Sleep CnC Beacon · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE W32/LetsGo.APT Sleep CnC Beacon";
    flow:established,to_server;
    http.uri;
    pcre:"/\.html\?[0-9]{10}$/";
    http.user_agent;
    content:"sleep|20|"; fast_pattern; startswith;
    pcre:"/^sleep \d+[\r\x2c]/";
    reference:url,www.fireeye.com/blog/technical/targeted-attack/2013/03/the-dingo-and-the-baby.html;
    classtype:targeted-activity;
    sid:2016568; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2013_03_14, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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