ET ATTACK_RESPONSE r57 phpshell footer detected

Query · suricata

flow:established,from_server;
content:"r57shell - http-shell by RST/GHC";
Raw source ET ATTACK_RESPONSE r57 phpshell footer detected · 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 $HTTP_SERVERS any -> $EXTERNAL_NET any (
    msg:"ET ATTACK_RESPONSE r57 phpshell footer detected";
    flow:established,from_server;
    content:"r57shell - http-shell by RST/GHC";
    reference:url,www.pestpatrol.com/spywarecenter/pest.aspx?id=453096755;
    classtype:web-application-activity;
    sid:2003535; rev:8;
    metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_09_27;
)

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