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Microsoft Build Engine Loading Windows Credential Libraries

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Microsoft Build Engine Loading Windows Credential Libraries

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An instance of MSBuild, the Microsoft Build Engine, loaded DLLs (dynamically linked libraries) responsible for Windows credential management. This technique is sometimes used for credential dumping.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Credential Access

Version: 6 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.11.2

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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The Build Engine is commonly used by Windows developers but use by non-engineers is unusual.

Rule query

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event.category:process and event.type:change and
(process.pe.original_file_name:(vaultcli.dll or SAMLib.DLL) or
dll.name:(vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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Version 6 (7.11.2 release)
  • Formatting only
Version 5 (7.11.0 release)

  • Updated query, changed from:

    event.category:process and event.type:change and
(winlog.event_data.OriginalFileName:(vaultcli.dll or SAMLib.DLL) or
dll.name:(vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe
Version 4 (7.10.0 release)
  • Formatting only
Version 3 (7.9.1 release)
  • Formatting only
Version 2 (7.9.0 release)

  • Updated query, changed from:

    (winlog.event_data.OriginalFileName: (vaultcli.dll or SAMLib.DLL) or
dll.name: (vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe
and event.action: "Image loaded (rule: ImageLoad)"
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