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Suspicious Endpoint Security Parent Processedit

A suspicious Endpoint Security parent process was detected. This may indicate a process hollowing or other form of code injection.

Rule type: eql

Rule indices:

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

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: None

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend

Version: 111

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setupedit

Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule queryedit

process where host.os.type == "windows" and event.type == "start" and
  process.name : ("esensor.exe", "elastic-endpoint.exe") and
  process.parent.executable != null and
  /* add FPs here */
  not process.parent.executable : (
        "?:\\Program Files\\Elastic\\*",
        "?:\\Windows\\System32\\services.exe",
        "?:\\Windows\\System32\\WerFault*.exe",
        "?:\\Windows\\System32\\wermgr.exe",
        "?:\\Windows\\explorer.exe"
  ) and
  not (
    process.parent.executable : (
        "?:\\Windows\\System32\\cmd.exe",
        "?:\\Windows\\System32\\SecurityHealthHost.exe",
        "?:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe"
    ) and
    process.args : (
        "test", "version",
        "top", "run",
        "*help", "status",
        "upgrade", "/launch",
        "/enable"
    )
  )

Framework: MITRE ATT&CKTM

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