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

SID: 2062550Rev: 130 views

Sourceet/open

CreatedMay 22, 2025

UpdatedMay 22, 2025

Classificationdomain-c2

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;)

References

url	catalyst.prodaft.com/public/report/skitnet/overview#heading-1000
url	community.emergingthreats.net/t/sigs-et-malware-skitnet-bossnet-backdoor-dns-txt/2749

Metadata

attack targetClient_Endpoint

created at2025_05_22

deploymentPerimeter

signature severityMajor

tagSSL_TLS_SNI

updated at2025_05_22

mitre tactic idTA0011

mitre tactic nameCommand_And_Control

mitre technique idT1071

mitre technique nameApplication_Layer_Protocol

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