ET HUNTING RAR file exfiltration over raw TCP

Query · suricata

flow:established,to_server;
stream_size:server,<,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 exfiltration over raw TCP · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET HUNTING RAR file exfiltration over raw TCP";
    flow:established,to_server;
    stream_size:server,<,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:2035479; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_03_16, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_16;
)

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