Microsoft Build Engine Started an Unusual Process

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Microsoft Build Engine Started an Unusual Process

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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: new_terms

Rule indices:

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

Severity: low

Risk score: 21

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Tactic: Execution
  • Data Source: Elastic Defend

Version: 207

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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host.os.type:windows and event.category:process and event.type:start and process.parent.name:"MSBuild.exe" and
process.name.caseless:("csc.exe" or "iexplore.exe" or "powershell.exe")

Framework: MITRE ATT&CKTM