{"id":"c4568f5d-131f-4e78-83d4-45b2da0ec4f1","title":"Communication To LocaltoNet Tunneling Service Initiated - Linux","description":"Detects an executable initiating a network connection to \"LocaltoNet\" tunneling sub-domains.\nLocaltoNet is a reverse proxy that enables localhost services to be exposed to the Internet.\nAttackers have been seen to use this service for command-and-control activities to bypass MFA and perimeter controls.\n","author":"Andreas Braathen (mnemonic.io)","status":"test","level":"high","date":"2024-06-17","modified":"","tags":["attack.command-and-control","attack.t1572","attack.t1090","attack.t1102"],"technique_ids":["T1090","T1102","T1572"],"logsource":{"category":"network_connection","product":"linux"},"falsepositives":["Legitimate use of the LocaltoNet service."],"references":["https://localtonet.com/documents/supported-tunnels","https://cloud.google.com/blog/topics/threat-intelligence/unc3944-targets-saas-applications"],"source_path":"rules/linux/network_connection/net_connection_lnx_domain_localtonet_tunnel.yml","source_sha256":"b4430d86f381852608314bb2038e181886dc1ec0dedbbb3ae0c3d100feebb5ca","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/linux/network_connection/net_connection_lnx_domain_localtonet_tunnel.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Communication To LocaltoNet Tunneling Service Initiated - Linux\nid: c4568f5d-131f-4e78-83d4-45b2da0ec4f1\nstatus: test\ndescription: |\n    Detects an executable initiating a network connection to \"LocaltoNet\" tunneling sub-domains.\n    LocaltoNet is a reverse proxy that enables localhost services to be exposed to the Internet.\n    Attackers have been seen to use this service for command-and-control activities to bypass MFA and perimeter controls.\nreferences:\n    - https://localtonet.com/documents/supported-tunnels\n    - https://cloud.google.com/blog/topics/threat-intelligence/unc3944-targets-saas-applications\nauthor: Andreas Braathen (mnemonic.io)\ndate: 2024-06-17\ntags:\n    - attack.command-and-control\n    - attack.t1572\n    - attack.t1090\n    - attack.t1102\nlogsource:\n    category: network_connection\n    product: linux\ndetection:\n    selection:\n        DestinationHostname|endswith:\n            - '.localto.net'\n            - '.localtonet.com'\n        Initiated: 'true'\n    condition: selection\nfalsepositives:\n    - Legitimate use of the LocaltoNet service.\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1090","id":"T1090","name":"Proxy","page":"techniques/enterprise/T1090/"},{"key":"enterprise/T1102","id":"T1102","name":"Web Service","page":"techniques/enterprise/T1102/"},{"key":"enterprise/T1572","id":"T1572","name":"Protocol Tunneling","page":"techniques/enterprise/T1572/"}],"data_path":"data/detection-rules/c4568f5d-131f-4e78-83d4-45b2da0ec4f1.json","kind":"sigma"}