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Elastic Docs ›Elastic Security Solution [8.2] ›Detections and alerts ›Prebuilt rule reference

Unusual Parent Process for cmd.exe

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Unusual Parent Process for cmd.exe

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Identifies a suspicious parent child process relationship with cmd.exe descending from an unusual process.

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
  • Execution

Version: 5 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.2.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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## Config

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 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

Rule query

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process where event.type in ("start", "process_started") and
process.name : "cmd.exe" and process.parent.name : ("lsass.exe",
"csrss.exe", "epad.exe",
"regsvr32.exe", "dllhost.exe",
"LogonUI.exe", "wermgr.exe",
"spoolsv.exe", "jucheck.exe",
"jusched.exe", "ctfmon.exe",
"taskhostw.exe", "GoogleUpdate.exe",
"sppsvc.exe", "sihost.exe",
"slui.exe", "SIHClient.exe",
"SearchIndexer.exe",
"SearchProtocolHost.exe",
"FlashPlayerUpdateService.exe",
"WerFault.exe", "WUDFHost.exe",
"unsecapp.exe", "wlanext.exe" )

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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Version 5 (8.2.0 release)
  • Formatting only
Version 4 (7.13.0 release)

  • Updated query, changed from:

    event.category:process and event.type:(start or process_started) and
process.name:cmd.exe and process.parent.name:(lsass.exe or csrss.exe
or notepad.exe or regsvr32.exe or dllhost.exe or LogonUI.exe or
wermgr.exe or spoolsv.exe or jucheck.exe or jusched.exe or ctfmon.exe
or taskhostw.exe or GoogleUpdate.exe or sppsvc.exe or sihost.exe or
slui.exe or SIHClient.exe or SearchIndexer.exe or
SearchProtocolHost.exe or FlashPlayerUpdateService.exe or WerFault.exe
or WUDFHost.exe or unsecapp.exe or wlanext.exe)
Version 3 (7.12.0 release)
  • Formatting only
Version 2 (7.11.2 release)
  • Formatting only
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