Query: write Sigma for 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 usage of winget to add a new insecure (http) download source. Winget will not allow the addition of insecure sou. Logsource: windows / process_creation. Rule: title: Add Insecure Download Source To Winget id: 81a0ecb5-0a41-4ba1-b2ba-c944eb92bfa2 related: - id: 05ebafc8-7aa2-4bcd-a269-2aec93f9e842 type: similar - id: c15a46a0-07d4-4c87-b4b6-89207835a83b type: similar status: test description: 'Detects usage of winget to add a new insecure (http) download source. Winget will not allow the addition of insecure sources, hence this could indicate potential suspicious activity (or typos) ' references: - https://learn.microsoft.com/en-us/windows/package-manager/winget/source - https://github.com/nasbench/Misc-Research/tree/b9596e8109dcdb16ec353f316678927e507a5b8d/LOLBINs/Winget author: Nasreddine Bencherchali (Nextron Systems) date: 2023-04-17 tags: - attack.execution - attack.t1059 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \winget.exe - OriginalFileName: winget.exe selection_cli: CommandLine|contains|all: - 'source ' - 'add ' - http:// condition: all of selection_* falsepositives: - False positives might occur if the users are unaware of such control checks level: high