ET USER_AGENTS Suspicious User-Agent (cso)

Query · suricata

flow:established,to_server;
http.user_agent;
content:"cso v"; startswith; fast_pattern;
pcre:"/^[0-9][0-9]?\.[0-9][0-9]?$/R";
Raw source ET USER_AGENTS Suspicious User-Agent (cso) · 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 -> $EXTERNAL_NET any (
    msg:"ET USER_AGENTS Suspicious User-Agent (cso)";
    flow:established,to_server;
    http.user_agent;
    content:"cso v"; startswith; fast_pattern;
    pcre:"/^[0-9][0-9]?\.[0-9][0-9]?$/R";
    reference:md5,5640851c35221c3ae7bbde053d1bb38e;
    reference:url,app.any.run/tasks/d94c1428-253d-432a-be65-53ea3a0505f4/;
    classtype:trojan-activity;
    sid:2030600; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_07_27, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_27;
)

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