PowerShell Mailbox Collection Script

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Detects PowerShell scripts that can be used to collect data from mailboxes. Adversaries may target user email to collect sensitive information.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Collection
  • PowerShell

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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event.category:process and
  (
   powershell.file.script_block_text : (
      "Microsoft.Office.Interop.Outlook" or
      "Interop.Outlook.olDefaultFolders" or
      "::olFolderInBox"
   ) or
   powershell.file.script_block_text : (
      "Microsoft.Exchange.WebServices.Data.Folder" or
      "Microsoft.Exchange.WebServices.Data.FileAttachment"
   )
   )

Framework: MITRE ATT&CKTM