ET MALWARE Backdoor.Win32.PcClient.bal CnC (OUTBOUND)

Query · suricata

flow:to_server,established;
dsize:248;
content:"|18 18|"; offset:2; depth:2;
content:!"|18 18|"; within:2;
content:"|18 18|"; distance:2; within:2;
content:!"|18 18|"; within:2;
content:"|18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18|";
pcre:"/[^\x18][^\x44\x32\x33\x25\x64\x22\x23\x3a\x27\x24\x26\x34\x3b\x12][\x20\x21\x28-\x2f\x70-\x77\x79-\x7f\x60-\x63\x65\x66\x67-\x6f\x50-\x5f\x40-\x42\x46-\x4f\x30\x31\x35\x36\x38\x3e\x39\x3b]{1,14}\x18/R";
Raw source ET MALWARE Backdoor.Win32.PcClient.bal CnC (OUTBOUND) · 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 $HOME_NET any -> $EXTERNAL_NET ![445,139] (
    msg:"ET MALWARE Backdoor.Win32.PcClient.bal CnC (OUTBOUND)";
    flow:to_server,established;
    dsize:248;
    content:"|18 18|"; offset:2; depth:2;
    content:!"|18 18|"; within:2;
    content:"|18 18|"; distance:2; within:2;
    content:!"|18 18|"; within:2;
    content:"|18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18|";
    pcre:"/[^\x18][^\x44\x32\x33\x25\x64\x22\x23\x3a\x27\x24\x26\x34\x3b\x12][\x20\x21\x28-\x2f\x70-\x77\x79-\x7f\x60-\x63\x65\x66\x67-\x6f\x50-\x5f\x40-\x42\x46-\x4f\x30\x31\x35\x36\x38\x3e\x39\x3b]{1,14}\x18/R";
    reference:md5,16549f8a09fd5724f2107a8f18dca10b;
    classtype:command-and-control;
    sid:2019204; rev:11;
    metadata:created_at 2014_09_22, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_02;
)

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