ET MALWARE Linux/B1txor20 Backdoor DNS Tunnel Activity M3

Query · suricata

byte_test:1,&,128,3;
content:"|00 00 10 00 01 c0 0c 00 10 00 01 00 00 00 01|";
content:"1"; distance:3; within:1;
content:"E6NZxA"; distance:2; within:6; fast_pattern;
Raw source ET MALWARE Linux/B1txor20 Backdoor DNS Tunnel Activity M3 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert dns any any -> $HOME_NET any (
    msg:"ET MALWARE Linux/B1txor20 Backdoor DNS Tunnel Activity M3";
    byte_test:1,&,128,3;
    content:"|00 00 10 00 01 c0 0c 00 10 00 01 00 00 00 01|";
    content:"1"; distance:3; within:1;
    content:"E6NZxA"; distance:2; within:6; fast_pattern;
    reference:url,blog.netlab.360.com/b1txor20-use-of-dns-tunneling_en/;
    reference:md5,43fcb5f22a53a88e726ebef46095cd6b;
    classtype:command-and-control;
    sid:2035529; rev:2;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2022_03_18, deployment Perimeter, deployment Internal, malware_family B1txor20, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_18;
)

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