ET USER_AGENTS Suspicious User-Agent (checkonline)

Query · suricata

flow:established,to_server;
threshold:type limit,count 2,track by_src,seconds 300;
http.user_agent;
content:"checkonline"; depth:11; endswith;
Raw source ET USER_AGENTS Suspicious User-Agent (checkonline) · 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 USER_AGENTS Suspicious User-Agent (checkonline)";
    flow:established,to_server;
    threshold:type limit,count 2,track by_src,seconds 300;
    http.user_agent;
    content:"checkonline"; depth:11; endswith;
    classtype:trojan-activity;
    sid:2008749; rev:10;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2020_10_17;
)

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