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.*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Defense Evasion

Version: 4 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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process where event.type in ("start", "process_started", "info") and
process.name : ("esensor.exe", "elastic-endpoint.exe") and
process.parent.executable != null and /* add FPs here */ not
process.parent.executable : ("C:\\Program Files\\Elastic\\*",
"C:\\Windows\\System32\\services.exe",
"C:\\Windows\\System32\\WerFault*.exe",
"C:\\Windows\\System32\\wermgr.exe")

Threat mapping

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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/

Rule version history

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Version 4 (7.12.0 release)

Formatting only

Version 3 (7.11.2 release)

Formatting only

Version 2 (7.11.0 release)

Updated query, changed from:

event.category:process and event.type:(start or process_started) and
process.name:(esensor.exe or "elastic-endpoint.exe" or "elastic-
agent.exe") and not
process.parent.executable:"C:\Windows\System32\services.exe"

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