ET MALWARE Backdoor.Elise CnC Beacon 1 M2

Query · suricata

flow:to_server,established;
content:"Cookie|3a 20|A="; fast_pattern;
http.method;
content:"GET";
http.uri;
content:"/"; offset:9; depth:1;
content:".html"; nocase; endswith;
pcre:"/^\/[a-f0-9]{8}\/\D+\d{8,10}\.html$/i";
http.header_names;
content:!"Accept-";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Backdoor.Elise CnC Beacon 1 M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Backdoor.Elise CnC Beacon 1 M2";
    flow:to_server,established;
    content:"Cookie|3a 20|A="; fast_pattern;
    http.method;
    content:"GET";
    http.uri;
    content:"/"; offset:9; depth:1;
    content:".html"; nocase; endswith;
    pcre:"/^\/[a-f0-9]{8}\/\D+\d{8,10}\.html$/i";
    http.header_names;
    content:!"Accept-";
    content:!"Referer|0d 0a|";
    reference:md5,23ace716ec34bfd9c98efd79b23a01af;
    reference:url,github.com/pan-unit42/iocs/tree/master/lotusblossom;
    classtype:command-and-control;
    sid:2021275; rev:9;
    metadata:attack_target Client_Endpoint, created_at 2015_06_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2022_03_24, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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