Accessing Outlook Data Files

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Identifies commands containing references to Outlook data files extensions, which can potentially indicate the search, access, or modification of these files.

Rule type: eql

Rule indices:

  • logs-endpoint.events.process-*
  • logs-windows.sysmon_operational-*
  • endgame-*
  • logs-system.security*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Collection
  • Data Source: Elastic Defend
  • Rule Type: BBR
  • Data Source: Sysmon
  • Data Source: Elastic Endgame

Version: 3

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "windows" and event.type == "start" and process.args : ("*.ost", "*.pst") and
  not process.name : "outlook.exe" and
  not (
        process.name : "rundll32.exe" and
        process.args : "*davclnt.dll,DavSetCookie*"
  )

Framework: MITRE ATT&CKTM