ET WEB_SPECIFIC_APPS Invalid/Suspicious User-Agent (PHP)

Query · suricata

flow:to_server,established;
http.user_agent;
content:"PHP/5."; nocase; fast_pattern; startswith;
pcre:"/^\{\d(?:\|\d){1,}\}\.\{\d(?:\|\d){1,}\}\{\d(?:\|\d){1,}\}/R";
Raw source ET WEB_SPECIFIC_APPS Invalid/Suspicious User-Agent (PHP) · 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 -> $HTTP_SERVERS any (
    msg:"ET WEB_SPECIFIC_APPS Invalid/Suspicious User-Agent (PHP)";
    flow:to_server,established;
    http.user_agent;
    content:"PHP/5."; nocase; fast_pattern; startswith;
    pcre:"/^\{\d(?:\|\d){1,}\}\.\{\d(?:\|\d){1,}\}\{\d(?:\|\d){1,}\}/R";
    classtype:web-application-attack;
    sid:2022350; rev:4;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2016_01_12, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2020_06_17;
)

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