Accessing Outlook Data Files

Elastic Stack Serverless Security

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/