Suspicious Endpoint Security Parent Process

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.forwarded*
logs-windows.sysmon_operational-*
endgame-*
logs-system.security*
logs-m365_defender.event-*
logs-sentinel_one_cloud_funnel.*

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
Data Source: System
Data Source: Microsoft Defender for Endpoint
Data Source: Sysmon
Data Source: SentinelOne

Version: 313

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

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&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
Sub-technique:
- Name: Match Legitimate Name or Location
- ID: T1036.005
- Reference URL: https://attack.mitre.org/techniques/T1036/005/

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