ET HUNTING Possible PHP Backdoor Command Execution

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php";
content:"=system|28 27|"; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET HUNTING Possible PHP Backdoor Command Execution · 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 -> $HOME_NET any (
    msg:"ET HUNTING Possible PHP Backdoor Command Execution";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php";
    content:"=system|28 27|"; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:url,www.ic3.gov/Media/News/2022/220516.pdf;
    classtype:trojan-activity;
    sid:2036626; rev:1;
    metadata:affected_product PHP, attack_target Web_Server, created_at 2022_05_18, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_18, reviewed_at 2024_09_12;
)

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