Query: detection rule: Detects execition of commands and binaries from the context of The program compatibility assistant (Pcalua.exe). This ca
Matching passage: Sigma rule: Detects execition of commands and binaries from the context of The program compatibility assistant (Pcalua.exe). This ca. Logsource: windows / process_creation. Rule: title: Use of Pcalua For Execution id: 0955e4e1-c281-4fb9-9ee1-5ee7b4b754d2 related: - id: fa47597e-90e9-41cd-ab72-c3b74cfb0d02 type: obsolete status: test description: Detects execition of commands and binaries from the context of The program compatibility assistant (Pcalua.exe). This can be used as a LOLBIN in order to bypass application whitelisting. references: - https://lolbas-project.github.io/lolbas/Binaries/Pcalua/ - https://pentestlab.blog/2020/07/06/indirect-command-execution/ author: Nasreddine Bencherchali (Nextron Systems), E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community date: 2022-06-14 modified: 2023-01-04 tags: - attack.execution - attack.t1059 logsource: category: process_creation product: windows detection: selection: Image|endswith: \pcalua.exe CommandLine|contains: ' -a' condition: selection falsepositives: - Legitimate use by a via a batch script or by an administrator. 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