Query: rule covering Detects changes to the registry key "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\Userlist
Matching passage: Sigma rule: Detects changes to the registry key "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\Userlist. Logsource: windows / process_creation. Rule: title: Hiding User Account Via SpecialAccounts Registry Key - CommandLine id: 9ec9fb1b-e059-4489-9642-f270c207923d related: - id: f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd type: similar status: test 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. ' 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/ author: '@Kostastsale, TheDFIRReport' date: 2022-05-14 modified: 2024-08-23 tags: - attack.stealth - attack.t1564.002 logsource: category: process_creation product: windows detection: selection: Image|endswith: \reg.exe CommandLine|contains|all: - \SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList - add - /v - /d 0 condition: selection falsepositives: - System administrator activities level: medium regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_registry_special_accounts_hide_user/info.yml
Near-miss passage: Sigma rule: Detects potential DLL sideloading of "goopdate.dll", a DLL used by googleupdate.exe. Logsource: windows / image_load. Rule: title: Potential Goopdate.DLL Sideloading id: b6188d2f-b3c4-4d2c-a17d-9706e0851af0 status: test description: Detects potential DLL sideloading of "goopdate.dll", a DLL used by googleupdate.exe references: - https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/goofy-guineapig/NCSC-MAR-Goofy-Guineapig.pdf author: X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) date: 2023-05-15 modified: 2025-10-07 tags: - attack.persistence - attack.privilege-escalation - attack.execution - attack.stealth - attack.t1574.001 logsource: category: image_load product: windows detection: selection: ImageLoaded|endswith: \goopdate.dll filter_main_generic: ImageLoaded|startswith: - C:\Program Files (x86)\ - C:\Program Files\ filter_optional_dropbox_installer_temp: Image|contains|all: - \AppData\Local\Temp\GUM - .tmp\Dropbox ImageLoaded|contains|all: - \AppData\Local\Temp\GUM - .tmp\goopdate.dll filter_optional_googleupdate_temp: Image|contains: - \AppData\Local\Temp\GUM - :\Windows\SystemTemp\GUM Image|endswith: .tmp\GoogleUpdate.exe ImageLoaded|contains: - \AppData\Local\Temp\GUM - :\Windows\SystemTemp\GUM condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - False positives are expected from Google Chrome installations running from user locations (AppData) and other custom locations. Apply additional filters accordingly. - Other third party chromium browsers located in AppData level: medium