ET HUNTING RAR file download over raw TCP

Query · suricata

flow:established,to_client;
stream_size:client,<,5;
dsize:>11;
content:"Rar|21 1a 07 00|"; fast_pattern; startswith;
content:"|73|"; distance:2;
content:"|00 00|"; distance:4;
Raw source ET HUNTING RAR file download over raw TCP · 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 tcp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING RAR file download over raw TCP";
    flow:established,to_client;
    stream_size:client,<,5;
    dsize:>11;
    content:"Rar|21 1a 07 00|"; fast_pattern; startswith;
    content:"|73|"; distance:2;
    content:"|00 00|"; distance:4;
    reference:url,forensicswiki.xyz/page/RAR;
    classtype:misc-activity;
    sid:2035481; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_03_16, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_16;
)

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