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Elastic Docs ›Elastic Security Solution [8.8] ›Detections and alerts ›Prebuilt rule reference

Suspicious Inter-Process Communication via Outlook

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Suspicious Inter-Process Communication via Outlook

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Detects Inter-Process Communication with Outlook via Component Object Model from an unusual process. Adversaries may target user email to collect sensitive information or send email on their behalf via API.

Rule type: eql

Rule indices:

  • logs-endpoint.events.*

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:

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

Version: 5

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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sequence with maxspan=1m
[process where host.os.type == "windows" and event.action == "start" and
  (
    process.name : (
      "rundll32.exe", "mshta.exe", "powershell.exe", "pwsh.exe",
      "cmd.exe", "regsvr32.exe", "cscript.exe", "wscript.exe"
    ) or
    (
      (process.code_signature.trusted == false or process.code_signature.exists == false) and
      (process.Ext.relative_file_creation_time <= 500 or process.Ext.relative_file_name_modify_time <= 500)
    )
  )
] by process.executable
[process where host.os.type == "windows" and event.action == "start" and process.name : "OUTLOOK.EXE" and
  process.Ext.effective_parent.name != null] by process.Ext.effective_parent.executable

Framework: MITRE ATT&CKTM

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