ET MALWARE APT Lazarus Nukesped Downloader

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".asp"; endswith;
http.header;
content:"Accept-Language|3a 20|ko-KR|3b|q=";
http.request_body;
content:"fn="; depth:3; nocase;
content:".gif&code="; nocase; distance:0; fast_pattern;
pcre:"/^fn=[^&]*\.gif&code=\d+$/i";
Raw source ET MALWARE APT Lazarus Nukesped Downloader · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT Lazarus Nukesped Downloader";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".asp"; endswith;
    http.header;
    content:"Accept-Language|3a 20|ko-KR|3b|q=";
    http.request_body;
    content:"fn="; depth:3; nocase;
    content:".gif&code="; nocase; distance:0; fast_pattern;
    pcre:"/^fn=[^&]*\.gif&code=\d+$/i";
    reference:url,www.welivesecurity.com/2020/11/16/lazarus-supply-chain-attack-south-korea/;
    classtype:command-and-control;
    sid:2031207; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_16, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_16;
)

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