Query: detection rule: Detects uncommon "userinit.exe" child processes, which could be a sign of uncommon shells or login scripts used for pers
Matching passage: Sigma rule: Detects uncommon "userinit.exe" child processes, which could be a sign of uncommon shells or login scripts used for pers. Logsource: windows / process_creation. Rule: title: Uncommon Userinit Child Process id: 0a98a10c-685d-4ab0-bddc-b6bdd1d48458 related: - id: 21d856f9-9281-4ded-9377-51a1a6e2a432 type: similar status: test description: Detects uncommon "userinit.exe" child processes, which could be a sign of uncommon shells or login scripts used for persistence. references: - https://cocomelonc.github.io/persistence/2022/12/09/malware-pers-20.html - https://learn.microsoft.com/en-us/windows-server/administration/server-core/server-core-sconfig#powershell-is-the-default-shell-on-server-core author: Tom Ueltschi (@c_APT_ure), Tim Shelton date: 2019-01-12 modified: 2023-11-14 tags: - attack.privilege-escalation - attack.t1037.001 - attack.persistence logsource: category: process_creation product: windows detection: selection: ParentImage|endswith: \userinit.exe filter_main_explorer: Image|endswith: :\WINDOWS\explorer.exe filter_optional_logonscripts: CommandLine|contains: - netlogon.bat - UsrLogon.cmd filter_optional_windows_core: CommandLine: PowerShell.exe filter_optional_proquota: Image|endswith: - :\Windows\System32\proquota.exe - :\Windows\SysWOW64\proquota.exe filter_optional_citrix: Image|endswith: - :\Program Files (x86)\Citrix\HDX\bin\cmstart.exe - :\Program Files (x86)\Citrix\HDX\bin\icast.exe - :\Program Files (x86)\Citrix\System32\icast.exe - :\Program Files\Citrix\HDX\bin\cmstart.exe - :\Program Files\Citrix\HDX\bin\icast.exe - :\Program Files\Citrix\System32\icast.exe filter_optional_image_null: Image: null condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Legitimate logon scripts or custom shells may trigger false positives. Apply additional filters accordingly. level: high
Near-miss passage: Sigma rule: Detects the execution "AccCheckConsole" a command-line tool for verifying the accessibility implementation of an applica. Logsource: windows / process_creation. Rule: title: Potential DLL Injection Via AccCheckConsole id: 0f6da907-5854-4be6-859a-e9958747b0aa status: test description: 'Detects the execution "AccCheckConsole" a command-line tool for verifying the accessibility implementation of an application''s UI. One of the tests that this checker can run are called "verification routine", which tests for things like Consistency, Navigation, etc. The tool allows a user to provide a DLL that can contain a custom "verification routine". An attacker can build such DLLs and pass it via the CLI, which would then be loaded in the context of the "AccCheckConsole" utility. ' references: - https://gist.github.com/bohops/2444129419c8acf837aedda5f0e7f340 - https://twitter.com/bohops/status/1477717351017680899?s=12 - https://lolbas-project.github.io/lolbas/OtherMSBinaries/AccCheckConsole/ author: Florian Roth (Nextron Systems) date: 2022-01-06 modified: 2024-08-29 tags: - attack.execution - detection.threat-hunting logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \AccCheckConsole.exe - OriginalFileName: AccCheckConsole.exe selection_cli: CommandLine|contains: - ' -hwnd' - ' -process ' - ' -window ' condition: all of selection_* falsepositives: - Legitimate use of the UI Accessibility Checker level: medium