ET MALWARE SNIcat - Detected C2 Commands (CB)

Query · suricata

flow:established,to_server;
tls.sni;
content:"CB-"; startswith; fast_pattern;
pcre:"/^CB-[A-Za-z0-9]{16}\./";
Raw source ET MALWARE SNIcat - Detected C2 Commands (CB) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SNIcat - Detected C2 Commands (CB)";
    flow:established,to_server;
    tls.sni;
    content:"CB-"; startswith; fast_pattern;
    pcre:"/^CB-[A-Za-z0-9]{16}\./";
    reference:url,mnemonic.no/blog/introducing-snicat/;
    reference:url,github.com/mnemonic-no/SNIcat/blob/master/signatures/snicat.rules;
    classtype:command-and-control;
    sid:2033804; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_26, deployment Perimeter, deployment SSLDecrypt, malware_family SNIcat, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;
)

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