{"id":"f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd","title":"Hiding User Account Via SpecialAccounts Registry Key","description":"Detects modifications 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.","author":"Nasreddine Bencherchali (Nextron Systems), frack113","status":"test","level":"high","date":"2022-07-12","modified":"2023-01-26","tags":["attack.stealth","attack.t1564.002"],"technique_ids":["T1564.002"],"logsource":{"category":"registry_set","product":"windows"},"falsepositives":["Unknown"],"references":["https://thedfirreport.com/2022/07/11/select-xmrig-from-sqlserver/","https://github.com/redcanaryco/atomic-red-team/blob/40b77d63808dd4f4eafb83949805636735a1fd15/atomics/T1564.002/T1564.002.md#atomic-test-3---create-hidden-user-in-registry"],"source_path":"rules/windows/registry/registry_set/registry_set_special_accounts.yml","source_sha256":"a56cd1286f3a55af3ea6c5304cf58f1696f224f8f43576325b8566960987db29","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_special_accounts.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\nid: f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd\nrelated:\n    - id: 8a58209c-7ae6-4027-afb0-307a78e4589a\n      type: obsolete\n    - id: 9ec9fb1b-e059-4489-9642-f270c207923d\n      type: similar\nstatus: test\ndescription: Detects modifications 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/2022/07/11/select-xmrig-from-sqlserver/\n    - https://github.com/redcanaryco/atomic-red-team/blob/40b77d63808dd4f4eafb83949805636735a1fd15/atomics/T1564.002/T1564.002.md#atomic-test-3---create-hidden-user-in-registry\nauthor: Nasreddine Bencherchali (Nextron Systems), frack113\ndate: 2022-07-12\nmodified: 2023-01-26\ntags:\n    - attack.stealth\n    - attack.t1564.002\nlogsource:\n    category: registry_set\n    product: windows\ndetection:\n    selection:\n        TargetObject|contains: '\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\SpecialAccounts\\UserList'\n        Details: 'DWORD (0x00000000)'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\nregression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_special_accounts/info.yml\nsimulation:\n    - type: atomic-red-team\n      name: Create Hidden User in Registry\n      technique: T1564.002\n      atomic_guid: 173126b7-afe4-45eb-8680-fa9f6400431c\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/f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd.json","kind":"sigma"}