ET MALWARE Latrodectus 404 Response

Query · suricata

flow:established,to_client;
http.stat_code;
content:"404";
http.server;
content:"nginx/"; startswith;
file.data;
content:"<TITLE>404 Not Found</TITLE>|0a 20 20|"; fast_pattern;
content:"</BODY></HTML>"; distance:0;
pcre:"/^(?:\r\n){50}$/R";
target:dest_ip;
Raw source ET MALWARE Latrodectus 404 Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Latrodectus 404 Response";
    flow:established,to_client;
    http.stat_code;
    content:"404";
    http.server;
    content:"nginx/"; startswith;
    file.data;
    content:"<TITLE>404 Not Found</TITLE>|0a 20 20|"; fast_pattern;
    content:"</BODY></HTML>"; distance:0;
    pcre:"/^(?:\r\n){50}$/R";
    classtype:trojan-activity;
    sid:2049233; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_11_15, deployment Perimeter, malware_family Latrodectus, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_15;
    target:dest_ip;
)

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