ET MALWARE Cloud Atlas CnC Beacon

Query · suricata

flow:established,to_server;
urilen:10;
threshold:type limit, count 1, seconds 120, track by_src;
http.method;
content:"POST";
http.uri;
content:"/check.jsp"; fast_pattern;
http.content_type;
content:"application/octet-stream"; bsize:24;
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE Cloud Atlas 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 any (
    msg:"ET MALWARE Cloud Atlas CnC Beacon";
    flow:established,to_server;
    urilen:10;
    threshold:type limit, count 1, seconds 120, track by_src;
    http.method;
    content:"POST";
    http.uri;
    content:"/check.jsp"; fast_pattern;
    http.content_type;
    content:"application/octet-stream"; bsize:24;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,securelist.com/blog/research/68083/cloud-atlas-redoctober-apt-is-back-in-style/;
    classtype:command-and-control;
    sid:2019919; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2014_12_11, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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