ET HUNTING PNG image exfiltration over raw TCP

Query · suricata

flow:established,to_server;
stream_size:server,<,160;
dsize:>11;
content:"|89|PNG|0d 0a 1a 0a 00 00 00 0d|IHDR|00 00|"; startswith;
flowbits:set,ET.tcpraw.png;

Rule dependencies

Feeds into

Raw source ET HUNTING PNG image 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 ![80,8080] -> $EXTERNAL_NET any (
    msg:"ET HUNTING PNG image exfiltration over raw TCP";
    flow:established,to_server;
    stream_size:server,<,160;
    dsize:>11;
    content:"|89|PNG|0d 0a 1a 0a 00 00 00 0d|IHDR|00 00|"; startswith;
    flowbits:set,ET.tcpraw.png;
    reference:md5,a271e5179f0a98a295736bd7a41a39fc;
    classtype:misc-activity;
    sid:2035476; rev:3;
    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_05_23, reviewed_at 2025_04_17;
)

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