ET INFO Observed Reverse Proxy/Tunneling Service Domain (localto .net) in TLS SNI

SID: 2063132Rev: 15 views
Sourceet/open
CreatedJune 23, 2025
UpdatedJune 23, 2025
Classificationmisc-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Reverse Proxy/Tunneling Service Domain (localto .net) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".localto.net"; endswith; fast_pattern; reference:url,github.com/SigmaHQ/sigma/blob/master/rules/linux/network_connection/net_connection_lnx_domain_localtonet_tunnel.yml; classtype:misc-activity; sid:2063132; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2025_06_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_06_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1665, mitre_technique_name Hide_Infrastructure;)

References

urlgithub.com/SigmaHQ/sigma/blob/master/rules/linux/network_connection/net_connection_lnx_domain_localtonet_tunnel.yml

Metadata

affected productAny
attack targetClient_and_Server
created at2025_06_23
deploymentPerimeter
performance impactLow
confidenceHigh
signature severityInformational
updated at2025_06_23
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1665
mitre technique nameHide_Infrastructure

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