ET USER_AGENTS Suspicious User-Agent Detected (Downloader1.2)

Query · suricata

flow:established,to_server;
threshold:type limit,count 2,track by_src,seconds 300;
http.user_agent;
content:"Downloader"; depth:10;
pcre:"/^Downloader\d+\.\d/";
Raw source ET USER_AGENTS Suspicious User-Agent Detected (Downloader1.2) · 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 Detected (Downloader1.2)";
    flow:established,to_server;
    threshold:type limit,count 2,track by_src,seconds 300;
    http.user_agent;
    content:"Downloader"; depth:10;
    pcre:"/^Downloader\d+\.\d/";
    classtype:trojan-activity;
    sid:2008643; 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;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.