ET MALWARE DefendNot Installer User-Agent Observed

Query · suricata

flow:established,to_server;
http.user_agent;
content:"defendnot-install/"; startswith; fast_pattern;
target:src_ip;
Raw source ET MALWARE DefendNot Installer User-Agent Observed · Suricata
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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 DefendNot Installer User-Agent Observed";
    flow:established,to_server;
    http.user_agent;
    content:"defendnot-install/"; startswith; fast_pattern;
    reference:url,github.com/es3n1n/defendnot;
    classtype:trojan-activity;
    sid:2068057; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_03_06, deployment Perimeter, deployment SSLDecrypt, malware_family DefendNot, confidence High, signature_severity Major, updated_at 2026_03_06;
    target:src_ip;
)

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