ET MALWARE NanoCore RAT Keepalive Response 1

Query · suricata

flow:established,to_client;
dsize:36;
content:"|20 00 00 00|"; depth:4;
content:!"|F0 DE BC 0A|"; within:5;
content:!"|00 00 00 00|"; within:4;
content:!"|20 00 00 00 01 00 00 00|"; depth:8;
content:!"|20 00 00 00 eb 6e 00 00 00 00 00 00 08|"; depth:13;
flowbits:isset,ET.NanoCore;
threshold:type both, track by_src, count 10, seconds 120;
stream_size:client, <, 5000;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE NanoCore RAT Keepalive Response 1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET [!2504,!2505,!2032,1024:] -> $HOME_NET any (
    msg:"ET MALWARE NanoCore RAT Keepalive Response 1";
    flow:established,to_client;
    dsize:36;
    content:"|20 00 00 00|"; depth:4;
    content:!"|F0 DE BC 0A|"; within:5;
    content:!"|00 00 00 00|"; within:4;
    content:!"|20 00 00 00 01 00 00 00|"; depth:8;
    content:!"|20 00 00 00 eb 6e 00 00 00 00 00 00 08|"; depth:13;
    flowbits:isset,ET.NanoCore;
    threshold:type both, track by_src, count 10, seconds 120;
    stream_size:client, <, 5000;
    reference:md5,bf994dce3712fb66afa4a2ce5b3ceee4;
    reference:url,medium.com/@the_abjuri5t/nanocore-rat-hunting-guide-cb185473c1e0;
    classtype:trojan-activity;
    sid:2046909; rev:10;
    metadata:attack_target Client_Endpoint, created_at 2015_03_27, deployment Perimeter, malware_family NanoCore, performance_impact Moderate, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_26, former_sid 2810290;
)

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