ET MALWARE Linux/B1txor20 Backdoor Connectivity Check

Query · suricata

content:"|01|"; offset:2; depth:1;
content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
content:"|06 67 6f 6f 67 6c 65 03 63 6f 6d 00 00 00 00 01|"; distance:1; within:16; endswith; fast_pattern;
Raw source ET MALWARE Linux/B1txor20 Backdoor Connectivity Check · 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 Linux/B1txor20 Backdoor Connectivity Check";
    content:"|01|"; offset:2; depth:1;
    content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
    content:"|06 67 6f 6f 67 6c 65 03 63 6f 6d 00 00 00 00 01|"; distance:1; within:16; endswith; fast_pattern;
    reference:url,blog.netlab.360.com/b1txor20-use-of-dns-tunneling_en/;
    classtype:trojan-activity;
    sid:2035526; 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, updated_at 2022_03_18;
)

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