ET MALWARE Possible PHP.MAILER WebShell Generic Request Inbound

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/start_cache1.php"; fast_pattern; endswith;
Raw source ET MALWARE Possible PHP.MAILER WebShell Generic Request Inbound · Suricata
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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 -> any any (
    msg:"ET MALWARE Possible PHP.MAILER WebShell Generic Request Inbound";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/start_cache1.php"; fast_pattern; endswith;
    reference:url,blog.trendmicro.com/trendlabs-security-intelligence/spam-campaign-abuses-php-functions-for-persistence-uses-compromised-devices-for-evasion-and-intrusion/;
    classtype:trojan-activity;
    sid:2027969; rev:3;
    metadata:attack_target Server, created_at 2019_09_09, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_09_17;
)

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