ET MALWARE Backdoor.Elise CnC Beacon 2

Query · suricata

flow:to_server,established;
http.method;
content:"POST";
http.uri;
content:".html"; nocase; fast_pattern;
pcre:"/\/\d{8,10}\.html$/i";
http.content_len;
byte_test:0,=,0,0,string,dec;
http.host;
content:!"www.youdao.com"; startswith;
http.header_names;
content:!"Content-Type|0d 0a|";
content:!"Accept-";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Backdoor.Elise CnC Beacon 2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Backdoor.Elise CnC Beacon 2";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:".html"; nocase; fast_pattern;
    pcre:"/\/\d{8,10}\.html$/i";
    http.content_len;
    byte_test:0,=,0,0,string,dec;
    http.host;
    content:!"www.youdao.com"; startswith;
    http.header_names;
    content:!"Content-Type|0d 0a|";
    content:!"Accept-";
    content:!"Referer|0d 0a|";
    reference:md5,cfa7954722d4277d26e96edc3289a4ce;
    reference:url,github.com/pan-unit42/iocs/tree/master/lotusblossom;
    classtype:command-and-control;
    sid:2021276; rev:7;
    metadata:attack_target Client_Endpoint, created_at 2015_06_16, deployment Perimeter, performance_impact Significant, signature_severity Major, tag c2, updated_at 2024_04_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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