ET MALWARE W32/Echmark/MarkiRAT CnC Activity M3

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php?u=";
http.user_agent;
content:"WinHTTP"; bsize:7;
http.request_body;
content:"p=<br><mark>Hello|3a 20|"; startswith; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET MALWARE W32/Echmark/MarkiRAT CnC Activity M3 · 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/Echmark/MarkiRAT CnC Activity M3";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?u=";
    http.user_agent;
    content:"WinHTTP"; bsize:7;
    http.request_body;
    content:"p=<br><mark>Hello|3a 20|"; startswith; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:md5,1fe34d84a058156296e86888ddd5cac9;
    reference:url,securelist.com/ferocious-kitten-6-years-of-covert-surveillance-in-iran/102806/;
    classtype:command-and-control;
    sid:2033429; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_07_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_26;
)

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