Accessing Outlook Data Filesedit

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:


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


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

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

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