{"id":"f7997770-92c3-4ec9-b112-774c4ef96f96","title":"Winlogon AllowMultipleTSSessions Enable","description":"Detects when the 'AllowMultipleTSSessions' value is enabled.\nWhich allows for multiple Remote Desktop connection sessions to be opened at once.\nThis is often used by attacker as a way to connect to an RDP session without disconnecting the other users\n","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2022-09-09","modified":"2023-08-17","tags":["attack.persistence","attack.defense-impairment","attack.t1112"],"technique_ids":["T1112"],"logsource":{"category":"registry_set","product":"windows"},"falsepositives":["Legitimate use of the multi session functionality"],"references":["http://blog.talosintelligence.com/2022/09/lazarus-three-rats.html"],"source_path":"rules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml","source_sha256":"7aea56cc258b24c4d554b6a82fd3caaecd4e3d7a300b6f367df6058e92f7cf88","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Winlogon AllowMultipleTSSessions Enable\nid: f7997770-92c3-4ec9-b112-774c4ef96f96\nstatus: test\ndescription: |\n  Detects when the 'AllowMultipleTSSessions' value is enabled.\n  Which allows for multiple Remote Desktop connection sessions to be opened at once.\n  This is often used by attacker as a way to connect to an RDP session without disconnecting the other users\nreferences:\n    - http://blog.talosintelligence.com/2022/09/lazarus-three-rats.html\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-09-09\nmodified: 2023-08-17\ntags:\n    - attack.persistence\n    - attack.defense-impairment\n    - attack.t1112\nlogsource:\n    category: registry_set\n    product: windows\ndetection:\n    selection:\n        TargetObject|endswith: '\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\AllowMultipleTSSessions'\n        Details|endswith: DWORD (0x00000001)\n    condition: selection\nfalsepositives:\n    - Legitimate use of the multi session functionality\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1112","id":"T1112","name":"Modify Registry","page":"techniques/enterprise/T1112/"}],"data_path":"data/detection-rules/f7997770-92c3-4ec9-b112-774c4ef96f96.json","kind":"sigma"}