ET MALWARE Possible DNS Tunneling Observed

Query · suricata

dns.query;
content:".aaaaaaaaaaaa"; fast_pattern;
pcre:"/^[abcdefghiklmnopqrstvxyz123456789]{62}\.aaaaaaaaaaaa/";
Raw source ET MALWARE Possible DNS Tunneling Observed · 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 dns $HOME_NET any -> any any (
    msg:"ET MALWARE Possible DNS Tunneling Observed";
    dns.query;
    content:".aaaaaaaaaaaa"; fast_pattern;
    pcre:"/^[abcdefghiklmnopqrstvxyz123456789]{62}\.aaaaaaaaaaaa/";
    reference:url,www.welivesecurity.com/wp-content/uploads/2020/06/ESET_InvisiMole.pdf;
    classtype:trojan-activity;
    sid:2030352; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_18, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_18;
)

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