ET INFO Observed External IP Lookup Domain (2ip .ua) in TLS SNI

SID: 2063067Rev: 12 views
Sourceet/open
CreatedJune 18, 2025
UpdatedJune 18, 2025
Classificationmisc-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed External IP Lookup Domain (2ip .ua) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".2ip.ua"; endswith; fast_pattern; reference:url,github.com/SigmaHQ/sigma/blob/master/rules/windows/dns_query/dns_query_win_susp_external_ip_lookup.yml; classtype:misc-activity; sid:2063067; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2025_06_18, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_06_18;)

References

urlgithub.com/SigmaHQ/sigma/blob/master/rules/windows/dns_query/dns_query_win_susp_external_ip_lookup.yml

Metadata

affected productAny
attack targetClient_and_Server
created at2025_06_18
deploymentPerimeter
performance impactLow
confidenceHigh
signature severityInformational
updated at2025_06_18

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