Query: alert when Detects usage of the "Add-AppxPackage" or it's alias "Add-AppPackage" to install unsigned AppX packages
Matching passage: Sigma rule: Detects usage of the "Add-AppxPackage" or it's alias "Add-AppPackage" to install unsigned AppX packages. Logsource: windows / process_creation. Rule: title: Unsigned AppX Installation Attempt Using Add-AppxPackage id: 37651c2a-42cd-4a69-ae0d-22a4349aa04a related: - id: 975b2262-9a49-439d-92a6-0709cccdf0b2 type: similar - id: 9a025188-6f2d-42f8-bb2f-d3a83d24a5af type: similar status: test description: Detects usage of the "Add-AppxPackage" or it's alias "Add-AppPackage" to install unsigned AppX packages references: - https://learn.microsoft.com/en-us/windows/msix/package/unsigned-package - https://twitter.com/WindowsDocs/status/1620078135080325122 author: Nasreddine Bencherchali (Nextron Systems) date: 2023-01-31 tags: - attack.persistence - attack.stealth logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll selection_cmdlet: CommandLine|contains: - 'Add-AppPackage ' - 'Add-AppxPackage ' selection_flag: CommandLine|contains: ' -AllowUnsigned' condition: all of selection_* falsepositives: - Installation of unsigned packages for testing purposes level: medium
Near-miss passage: Sigma rule: Detects suspicious local connections via a named pipe to the AD FS configuration database (Windows Internal Database). U. Logsource: windows / pipe_created. Rule: title: ADFS Database Named Pipe Connection By Uncommon Tool id: 1ea13e8c-03ea-409b-877d-ce5c3d2c1cb3 status: test description: 'Detects suspicious local connections via a named pipe to the AD FS configuration database (Windows Internal Database). Used to access information such as the AD FS configuration settings which contains sensitive information used to sign SAML tokens. ' references: - https://github.com/Azure/Azure-Sentinel/blob/f99542b94afe0ad2f19a82cc08262e7ac8e1428e/Detections/SecurityEvent/ADFSDBNamedPipeConnection.yaml - https://o365blog.com/post/adfs/ - https://github.com/Azure/SimuLand author: Roberto Rodriguez @Cyb3rWard0g date: 2021-10-08 modified: 2023-11-30 tags: - attack.collection - attack.t1005 logsource: product: windows category: pipe_created definition: Note that you have to configure logging for Named Pipe Events in Sysmon config (Event ID 17 and Event ID 18). The basic configuration is in popular sysmon configuration (https://github.com/SwiftOnSecurity/sysmon-config), but it is worth verifying. You can also use other repo, e.g. https://github.com/Neo23x0/sysmon-config, https://github.com/olafhartong/sysmon-modular. How to test detection? You can check powershell script from this site https://svch0st.medium.com/guide-to-named-pipes-and-hunting-for-cobalt-strike-pipes-dc46b2c5f575 detection: selection: PipeName: \MICROSOFT##WID\tsql\query filter_main_generic: Image|endswith: - :\Windows\System32\mmc.exe - :\Windows\system32\svchost.exe - :\Windows\System32\wsmprovhost.exe - :\Windows\SysWOW64\mmc.exe - :\Windows\SysWOW64\wsmprovhost.exe - :\Windows\WID\Binn\sqlwriter.exe - \AzureADConnect.exe - \Microsoft.Identity.Health.Adfs.PshSurrogate.exe - \Microsoft.IdentityServer.ServiceHost.exe - \Microsoft.Tri.Sensor.exe - \sqlservr.exe - \tssdis.exe condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium