ET HUNTING Single Character jpg Requested via PowerShell

Query · suricata

flow:established,to_server;
urilen:6;
http.method;
content:"GET";
http.uri;
content:"|2e|jpg"; endswith;
pcre:"/^\x2f[a-zA-Z0-9]{1}\x2ejpg$/";
http.user_agent;
content:"WindowsPowerShell"; fast_pattern;
Raw source ET HUNTING Single Character jpg Requested via PowerShell · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Single Character jpg Requested via PowerShell";
    flow:established,to_server;
    urilen:6;
    http.method;
    content:"GET";
    http.uri;
    content:"|2e|jpg"; endswith;
    pcre:"/^\x2f[a-zA-Z0-9]{1}\x2ejpg$/";
    http.user_agent;
    content:"WindowsPowerShell"; fast_pattern;
    reference:md5,bf3f46460851ba21241123f81477e567;
    classtype:command-and-control;
    sid:2056739; rev:1;
    metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2024_10_21, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2024_10_21;
)

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