{"id":"9ec9fb1b-e059-4489-9642-f270c207923d","title":"Hiding User Account Via SpecialAccounts Registry Key - CommandLine","description":"Detects changes to the registry key \"HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\SpecialAccounts\\Userlist\" where the value is set to \"0\" in order to hide user account from being listed on the logon screen.\n","author":"@Kostastsale, TheDFIRReport","status":"test","level":"medium","date":"2022-05-14","modified":"2024-08-23","tags":["attack.stealth","attack.t1564.002"],"technique_ids":["T1564.002"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["System administrator activities"],"references":["https://thedfirreport.com/2024/01/29/buzzing-on-christmas-eve-trigona-ransomware-in-3-hours/","https://thedfirreport.com/2024/04/01/from-onenote-to-ransomnote-an-ice-cold-intrusion/","https://thedfirreport.com/2024/04/29/from-icedid-to-dagon-locker-ransomware-in-29-days/","https://thedfirreport.com/2022/07/11/select-xmrig-from-sqlserver/"],"source_path":"rules/windows/process_creation/proc_creation_win_registry_special_accounts_hide_user.yml","source_sha256":"56ff44ded56b19f669e6391bac01c6305b8bad3b142afa2cff99b975c89824da","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_registry_special_accounts_hide_user.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Hiding User Account Via SpecialAccounts Registry Key - CommandLine\nid: 9ec9fb1b-e059-4489-9642-f270c207923d\nrelated:\n    - id: f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd\n      type: similar\nstatus: test\ndescription: |\n    Detects changes to the registry key \"HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\SpecialAccounts\\Userlist\" where the value is set to \"0\" in order to hide user account from being listed on the logon screen.\nreferences:\n    - https://thedfirreport.com/2024/01/29/buzzing-on-christmas-eve-trigona-ransomware-in-3-hours/\n    - https://thedfirreport.com/2024/04/01/from-onenote-to-ransomnote-an-ice-cold-intrusion/\n    - https://thedfirreport.com/2024/04/29/from-icedid-to-dagon-locker-ransomware-in-29-days/\n    - https://thedfirreport.com/2022/07/11/select-xmrig-from-sqlserver/\nauthor: '@Kostastsale, TheDFIRReport'\ndate: 2022-05-14\nmodified: 2024-08-23\ntags:\n    - attack.stealth\n    - attack.t1564.002\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\reg.exe'\n        CommandLine|contains|all:\n            - '\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\SpecialAccounts\\UserList'\n            - 'add'\n            - '/v'\n            - '/d 0'\n    condition: selection\nfalsepositives:\n    - System administrator activities\nlevel: medium\nregression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_registry_special_accounts_hide_user/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1564.002","id":"T1564.002","name":"Hidden Users","page":"techniques/enterprise/T1564.002/"}],"data_path":"data/detection-rules/9ec9fb1b-e059-4489-9642-f270c207923d.json","kind":"sigma"}