Query: Sigma rule for Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges from a
Matching passage: Sigma rule: Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges from a. Logsource: windows / process_creation. Rule: title: Elevated System Shell Spawned From Uncommon Parent Location id: 178e615d-e666-498b-9630-9ed363038101 related: - id: 61065c72-5d7d-44ef-bf41-6a36684b545f type: similar status: test description: Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges from a uncommon parent location. references: - https://github.com/Wh04m1001/SysmonEoP author: frack113, Tim Shelton (update fp) date: 2022-12-05 modified: 2025-03-06 tags: - attack.privilege-escalation - attack.execution - attack.t1059 logsource: product: windows category: process_creation detection: selection_shell: - Image|endswith: - \powershell.exe - \powershell_ise.exe - \pwsh.exe - \cmd.exe - OriginalFileName: - PowerShell.EXE - powershell_ise.EXE - pwsh.dll - Cmd.Exe selection_user: User|contains: - AUTHORI - AUTORI LogonId: '0x3e7' filter_main_generic: ParentImage|contains: - :\Program Files (x86)\ - :\Program Files\ - :\ProgramData\ - :\Windows\System32\ - :\Windows\SysWOW64\ - :\Windows\Temp\ - :\Windows\WinSxS\ filter_optional_manageengine: ParentImage|endswith: :\ManageEngine\ADManager Plus\pgsql\bin\postgres.exe Image|endswith: \cmd.exe filter_optional_asgard: CommandLine|contains: :\WINDOWS\system32\cmd.exe /c " CurrentDirectory|contains: :\WINDOWS\Temp\asgard2-agent\ filter_optional_ibm_spectrumprotect: ParentImage|contains: :\IBM\SpectrumProtect\webserver\scripts\ CommandLine|contains: :\IBM\SpectrumProtect\webserver\scripts\ filter_main_parent_null: ParentImage: null filter_main_parent_empty: ParentImage: - '' - '-' condition: all of selection_* and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Some legitimate applications may spawn shells from uncommon parent locations. Apply additional filters and perform an initial baseline before deploying. level: medium
Near-miss passage: Sigma rule: Detects a suspicious IIS module registration as described in Microsoft threat report on IIS backdoors. Logsource: windows / process_creation. Rule: title: Suspicious IIS Module Registration id: 043c4b8b-3a54-4780-9682-081cb6b8185c status: test description: Detects a suspicious IIS module registration as described in Microsoft threat report on IIS backdoors references: - https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/ author: Florian Roth (Nextron Systems), Microsoft (idea) date: 2022-08-04 modified: 2023-01-23 tags: - attack.persistence - attack.t1505.004 logsource: category: process_creation product: windows detection: selection_parent: ParentImage|endswith: \w3wp.exe selection_cli_1: CommandLine|contains: appcmd.exe add module selection_cli_2: CommandLine|contains: ' system.enterpriseservices.internal.publish' Image|endswith: \powershell.exe selection_cli_3: CommandLine|contains|all: - gacutil - ' /I' condition: selection_parent and 1 of selection_cli_* falsepositives: - Administrative activity level: high