ET MALWARE Observed Skitnet/Bossnet Domain (100000000000000... in TLS SNI)

Query · suricata

flow:established,to_server;
tls.sni; bsize:>15;
content:"100000000000000"; fast_pattern;
pcre:"/^[a-f0-9]{2}+\x2ecom$/R";
Raw source ET MALWARE Observed Skitnet/Bossnet Domain (100000000000000... in TLS SNI) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Observed Skitnet/Bossnet Domain (100000000000000... in TLS SNI)";
    flow:established,to_server;
    tls.sni; bsize:>15;
    content:"100000000000000"; fast_pattern;
    pcre:"/^[a-f0-9]{2}+\x2ecom$/R";
    reference:url,catalyst.prodaft.com/public/report/skitnet/overview#heading-1000;
    reference:url,community.emergingthreats.net/t/sigs-et-malware-skitnet-bossnet-backdoor-dns-txt/2749;
    classtype:domain-c2;
    sid:2062550; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_05_22, deployment Perimeter, signature_severity Major, tag SSL_TLS_SNI, updated_at 2025_05_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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