ET WEB_SERVER Image Content-Type with Obfuscated PHP (Seen with C99 Shell)

Query · suricata

flow:from_server,established;
http.content_type;
content:"image/"; startswith;
file.data;
content:"eval(gzinflate(base64_decode("; distance:0; fast_pattern;
Raw source ET WEB_SERVER Image Content-Type with Obfuscated PHP (Seen with C99 Shell) · 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 WEB_SERVER Image Content-Type with Obfuscated PHP (Seen with C99 Shell)";
    flow:from_server,established;
    http.content_type;
    content:"image/"; startswith;
    file.data;
    content:"eval(gzinflate(base64_decode("; distance:0; fast_pattern;
    reference:url,malwaremustdie.blogspot.jp/2012/10/how-far-phpc99shell-malware-can-go-from.html;
    classtype:attempted-user;
    sid:2015755; rev:4;
    metadata:created_at 2012_10_02, signature_severity Major, updated_at 2020_04_22, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
)

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