Microsoft Build Engine Started an Unusual Processedit

An instance of MSBuild, the Microsoft Build Engine, started a PowerShell script or the Visual C# Command Line Compiler. This technique is sometimes used to deploy a malicious payload using the Build Engine.

Rule type: query

Rule indices:

  • winlogbeat-*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum signals per execution: 100



  • Elastic
  • Windows

Version: 1

Added (Elastic Stack release): 7.7.0

Potential false positivesedit

The Build Engine is commonly used by Windows developers but use by non-engineers is unusual. If a build system triggers this rule it can be exempted by process, user, or host name.

Rule queryedit and or
iexplore.exe or powershell.exe)

Threat mappingedit