Accessing Outlook Data Files

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*
• winlogbeat-*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[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
• Data Source: System

Version: 105

Rule authors:

• Elastic

Rule license: Elastic License v2

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

• Tactic:

  • Name: Collection
  • ID: TA0009
  • Reference URL: https://attack.mitre.org/tactics/TA0009/

• Technique:

  • Name: Email Collection
  • ID: T1114
  • Reference URL: https://attack.mitre.org/techniques/T1114/

• Sub-technique:

  • Name: Local Email Collection
  • ID: T1114.001
  • Reference URL: https://attack.mitre.org/techniques/T1114/001/