ET HUNTING Possible ELF executable sent when remote host claims to send a Text File

Query · suricata

flow:established,from_server;
http.header;
content:"Content-Type|3a 20|text/plain";
file.data;
content:"|7f 45 4c 46|"; startswith; fast_pattern;
isdataat:3000,relative;
Raw source ET HUNTING Possible ELF executable sent when remote host claims to send a Text File · 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 -> $HOME_NET any (
    msg:"ET HUNTING Possible ELF executable sent when remote host claims to send a Text File";
    flow:established,from_server;
    http.header;
    content:"Content-Type|3a 20|text/plain";
    file.data;
    content:"|7f 45 4c 46|"; startswith; fast_pattern;
    isdataat:3000,relative;
    classtype:bad-unknown;
    sid:2032973; rev:1;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2021_05_18, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_18;
)

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